chore: bump GitHub Actions to current major versions (#35)

## Summary

Pure version bumps for the four GitHub Actions referenced under
`.github/workflows/`. No behavior change — actions are pinned to current
majors (or the current SHA, in the case of the third-party publish
action).

| File | Action | Before | After |
|---|---|---|---|
| `github-actions.yml`, `coverage.yml`, `python-publish.yml`,
`codeql-analysis.yml` | `actions/checkout` | `@v3` | `@v5` |
| `github-actions.yml`, `coverage.yml`, `python-publish.yml` |
`actions/setup-python` | `@v3` | `@v5` |
| `codeql-analysis.yml` |
`github/codeql-action/{init,autobuild,analyze}` | `@v2` | `@v3` |
| `python-publish.yml` | `pypa/gh-action-pypi-publish` | old SHA |
`v1.14.0` SHA + version comment |

## Why now

The `@v3` actions ran on the **Node 16 runtime**, which reached
end-of-life in 2023 and is on borrowed time on GitHub-hosted runners.
`@v5` (and `codeql-action @v3`) all use Node 20, the current supported
runtime. We were also missing security/bug fixes shipped in newer
majors.

## Conventions used

- First-party actions (`actions/*`, `github/*`) → floating major-version
tag (`@v5`, `@v3`). Standard for first-party, low supply-chain risk.
- Third-party action (`pypa/gh-action-pypi-publish`) → stays SHA-pinned
for supply-chain safety. The trailing `# v1.14.0` comment makes the
human-readable version visible without sacrificing the immutable pin.

Closes #34

1 files changed, 4 insertions, 4 deletions

diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 921fe4c..94c2055 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -38,11 +38,11 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v5
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL
-      uses: github/codeql-action/init@v2
+      uses: github/codeql-action/init@v3
       with:
         languages: ${{ matrix.language }}
         # If you wish to specify custom queries, you can do so here or in a config file.
@@ -56,7 +56,7 @@ jobs:
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild
-      uses: github/codeql-action/autobuild@v2
+      uses: github/codeql-action/autobuild@v3
 
     # ℹ️ Command-line programs to run using the OS shell.
     # 📚 See https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsrun
@@ -69,4 +69,4 @@ jobs:
     #   ./location_of_script_within_repo/buildscript.sh
 
     - name: Perform CodeQL Analysis
-      uses: github/codeql-action/analyze@v2
+      uses: github/codeql-action/analyze@v3