ci: update GitHub Actions to Node.js 24-compatible versions

Upgrade actions/checkout from v4 to v6 and actions/setup-python
to v6 to resolve Node.js 20 deprecation warnings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: Oumou

.github/workflows/codeql.yml

@@ -59,7 +59,7 @@ jobs:
         # your codebase is analyzed, see https://docs.github.com/en/code-security/code-scanning/creating-an-advanced-setup-for-code-scanning/codeql-code-scanning-for-compiled-languages
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
 
     # Add any setup steps before running the `github/codeql-action/init` action.
     # This includes steps like installing compilers or runtimes (`actions/setup-node`

.github/workflows/publish.yml

@@ -12,7 +12,7 @@ jobs:
       contents: write
     steps:
       - name: Check out repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Quarto
         uses: quarto-dev/quarto-actions/setup@v2

.github/workflows/release-please.yml

@@ -30,8 +30,8 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v6
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.12'
       - name: Build distribution