Update six requirement from >=1.14.0 to >=1.17.0 (#29)

Updates the requirements on [six](https://github.com/benjaminp/six) to
permit the latest version.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/benjaminp/six/blob/main/CHANGES">six's
changelog</a>.</em></p>
<blockquote>
<h2>1.17.0</h2>
<ul>
<li>
<p>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/388">#388</a>:
Remove <code>URLopener</code> and <code>FancyURLopener</code> classes
from
<code>urllib.request</code> when running on Python 3.14 or greater.</p>
</li>
<li>
<p>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/365">#365</a>,
issue <a
href="https://redirect.github.com/benjaminp/six/issues/283">#283</a>:
<code>six.moves.UserDict</code> now points to
<code>UserDict.IterableUserDict</code> instead of
<code>UserDict.UserDict</code> on Python 2.</p>
</li>
</ul>
<h2>1.16.0</h2>
<ul>
<li>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/343">#343</a>,
issue <a
href="https://redirect.github.com/benjaminp/six/issues/341">#341</a>,
pull request <a
href="https://redirect.github.com/benjaminp/six/issues/349">#349</a>:
Port _SixMetaPathImporter to
Python 3.10.</li>
</ul>
<h2>1.15.0</h2>
<ul>
<li>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/331">#331</a>:
Optimize <code>six.ensure_str</code> and
<code>six.ensure_binary</code>.</li>
</ul>
<h2>1.14.0</h2>
<ul>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/288">#288</a>,
pull request <a
href="https://redirect.github.com/benjaminp/six/issues/289">#289</a>:
Add <code>six.assertNotRegex</code>.</p>
</li>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/317">#317</a>:
<code>six.moves._dummy_thread</code> now points to the
<code>_thread</code> module on
Python 3.9+. Python 3.7 and later requires threading and deprecated the
<code>_dummy_thread</code> module.</p>
</li>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/308">#308</a>,
pull request <a
href="https://redirect.github.com/benjaminp/six/issues/314">#314</a>:
Remove support for Python 2.6 and Python 3.2.</p>
</li>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/250">#250</a>,
issue <a
href="https://redirect.github.com/benjaminp/six/issues/165">#165</a>,
pull request <a
href="https://redirect.github.com/benjaminp/six/issues/251">#251</a>:
<code>six.wraps</code> now ignores missing
attributes. This follows the Python 3.2+ standard library behavior.</p>
</li>
</ul>
<h2>1.13.0</h2>
<ul>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/298">#298</a>,
pull request <a
href="https://redirect.github.com/benjaminp/six/issues/299">#299</a>:
Add <code>six.moves.dbm_ndbm</code>.</p>
</li>
<li>
<p>Issue <a
href="https://redirect.github.com/benjaminp/six/issues/155">#155</a>:
Add <code>six.moves.collections_abc</code>, which aliases the
<code>collections</code>
module on Python 2-3.2 and the <code>collections.abc</code> module on
Python 3.3 and greater.</p>
</li>
<li>
<p>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/304">#304</a>:
Re-add distutils fallback in <code>setup.py</code>.</p>
</li>
<li>
<p>Pull request <a
href="https://redirect.github.com/benjaminp/six/issues/305">#305</a>: On
Python 3.7, <code>with_metaclass</code> supports classes using PEP
560 features.</p>
</li>
</ul>
<h2>1.12.0</h2>
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</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/benjaminp/six/commit/ebd9b3af90247b8858d415a05e96e9ee61e48d07"><code>ebd9b3a</code></a>
six 1.17.0</li>
<li><a
href="https://github.com/benjaminp/six/commit/40d248e516ae9bb32221a417de49a3d2fd9e39c1"><code>40d248e</code></a>
Expunge travis.</li>
<li><a
href="https://github.com/benjaminp/six/commit/dd7940e4b8760c620e61dd0e99ec0e60ee759fc8"><code>dd7940e</code></a>
Add PyPI publication workflow. (<a
href="https://redirect.github.com/benjaminp/six/issues/390">#390</a>)</li>
<li><a
href="https://github.com/benjaminp/six/commit/8cb688f32f24b6ebe94938b15e92ec5c75dd8f12"><code>8cb688f</code></a>
Update copyright years.</li>
<li><a
href="https://github.com/benjaminp/six/commit/86f89c5da1488463a00bd090c8f9e29aeabf6a10"><code>86f89c5</code></a>
Add a GitHub actions CI workflow. (<a
href="https://redirect.github.com/benjaminp/six/issues/389">#389</a>)</li>
<li><a
href="https://github.com/benjaminp/six/commit/06430b9fc66e3912bea2c0a2d13b22d7054a9ac7"><code>06430b9</code></a>
Make test_getoutput work on Windows.</li>
<li><a
href="https://github.com/benjaminp/six/commit/ceddaf2d0a45cf3a19ce0ac63a24ca4ffc76ba7c"><code>ceddaf2</code></a>
Add a changelog for <a
href="https://redirect.github.com/benjaminp/six/issues/314">#314</a>.</li>
<li><a
href="https://github.com/benjaminp/six/commit/9a05aab157c79647aa11c49f31a6bff5b18404a5"><code>9a05aab</code></a>
Python 3.14 removed the URLopener and FancyURLopener classes from
urllib.req...</li>
<li><a
href="https://github.com/benjaminp/six/commit/c1b416f24de52ebd8eaed3e379ab85ec9c3e935b"><code>c1b416f</code></a>
Fix deprecation warning from setuptools (<a
href="https://redirect.github.com/benjaminp/six/issues/382">#382</a>)</li>
<li><a
href="https://github.com/benjaminp/six/commit/02c3bcab0b94eb7a86f6606bc8b02e3ee0a72860"><code>02c3bca</code></a>
tkinter.tix was removed from Python 3.13, skip the test (<a
href="https://redirect.github.com/benjaminp/six/issues/377">#377</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/benjaminp/six/compare/1.14.0...1.17.0">compare
view</a></li>
</ul>
</details>
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