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

- Update actions/checkout from v4 to v6
- Update actions/setup-python from v5 to v6 (Node.js 24 support)
- Update cpina/github-action-push-to-another-repository from v1.6 to v1

Resolves Node.js 20 deprecation warnings in CI workflows.

Author: KIBruh

.github/workflows/deploy-docs.yml

@@ -8,9 +8,9 @@ jobs:
   copy-doc:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - name: Deploy
-      uses: cpina/github-action-push-to-another-repository@v1.6
+      uses: cpina/github-action-push-to-another-repository@v1
       env:
         SSH_DEPLOY_KEY: ${{ secrets.OMD_CONSOL_DE_KEY }}
       with:

.github/workflows/tests.yml

@@ -9,10 +9,10 @@ jobs:
     name: Tests
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.9'
           cache: pip