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/build.yml

@@ -34,7 +34,7 @@ jobs:
       artifact-id: ${{ steps.upload.outputs.artifact-id }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         # Fetch history for Hugo's .GitInfo and .Lastmod
         fetch-depth: 0
@@ -92,7 +92,7 @@ jobs:
         extended: true
 
     # Cache dependencies (Go modules, node_modules) - stable, rarely changes
-    - uses: actions/cache@v4
+    - uses: actions/cache@v5
       with:
         path: |
           /tmp/hugo_cache_runner/
@@ -104,7 +104,7 @@ jobs:
           ${{ runner.os }}-hugo-deps-
 
     # Cache Hugo resources (processed images, CSS) - invalidates only when assets/config change
-    - uses: actions/cache@v4
+    - uses: actions/cache@v5
       with:
         path: resources/
         key: ${{ runner.os }}-hugo-resources-${{ hashFiles('assets/**/*', 'config/**/*',

templates/documentation/.github/workflows/deploy.yml

@@ -26,7 +26,7 @@ jobs:
       deploy-host: ${{ steps.check.outputs.host }}
     steps:
     - name: Checkout
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         sparse-checkout: hugoblox.yaml
         sparse-checkout-cone-mode: false

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"