chore: bump Hugo, Go, and Node.js to latest versions

- Hugo: 0.147.7 → 0.156.0
- Go: 1.24 → 1.26 (CI workflows and go.mod files)
- Node.js: 22 → 24 (LTS) in accessibility workflow

.github/workflows/pages.yml

@@ -31,7 +31,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     env:
-      HUGO_VERSION: 0.147.7
+      HUGO_VERSION: 0.156.0
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -43,7 +43,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v5
         with:
-          go-version: "1.24"
+          go-version: "1.26"
 
       - name: Setup Pages
         id: pages