ci: bump deploy actions to Node 24 versions (#4)

checkout v4->v6, setup-uv v6->v8, upload-pages-artifact v3->v5,
deploy-pages v4->v5. Clears the Node 20 deprecation warning.

Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>

Author: lesnik512

.github/workflows/deploy.yml

@@ -18,15 +18,15 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Install uv
-        uses: astral-sh/setup-uv@v6
+        uses: astral-sh/setup-uv@v8
         with:
           python-version: "3.11"
       - name: Build site
         run: uv run mkdocs build --strict
       - name: Upload Pages artifact
-        uses: actions/upload-pages-artifact@v3
+        uses: actions/upload-pages-artifact@v5
         with:
           path: site
 
@@ -39,4 +39,4 @@ jobs:
     steps:
       - name: Deploy to GitHub Pages
         id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5