chore(ci): bump GitHub Actions to Node.js 24-compatible versions

Bumps actions across all template and repo workflows to avoid the
Node.js 20 deprecation (enforced June 2026):
- actions/checkout v3/v4 → v6
- actions/cache v4 → v5
- actions/setup-go v5 → v6
- actions/setup-python v4/v5 → v6
- peter-evans/create-pull-request v5/v6 → v7

templates/documentation/.github/workflows/upgrade.yml

@@ -32,7 +32,7 @@ jobs:
     timeout-minutes: 15
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -48,7 +48,7 @@ jobs:
           run_install: false
 
       - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.23'
 
@@ -75,7 +75,7 @@ jobs:
 
 
       - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v6
+        uses: peter-evans/create-pull-request@v7
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: "chore(deps): upgrade hugoblox modules"