ci(docs): bump Pages actions to latest node24 pins

GitHub forces Node 20 actions onto Node 24 starting 2026-06-16 and removes
Node 20 from runners 2026-09-16. Bump checkout v5->v6.0.3, setup-python
v5.6.0->v6.2.0, upload-pages-artifact v3->v5.0.0, configure-pages v5->v6.0.0,
deploy-pages v4->v5.0.0 (the matched current node24 Pages set).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: h4x0r

.github/workflows/docs.yml

@@ -14,10 +14,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
 
       - name: Setup Python
-        uses: actions/setup-python@8d9ed9ac5c53483de85588cdf95a591a75ab9f55 # v5
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
 
       - name: Install MkDocs Material
         run: pip install mkdocs-material