chore: update GitHub Actions to latest major versions (#879)

- actions/checkout v5 -> v7
- actions/setup-python v6 -> v7
- actions/configure-pages v5 -> v6
- actions/upload-pages-artifact v3 -> v5
- actions/deploy-pages v4 -> v5
- actions/upload-artifact v4 -> v7
- actions/download-artifact v4 -> v8
- docker/setup-qemu-action v3 -> v4
- docker/setup-buildx-action v3 -> v4
- docker/metadata-action v5 -> v6
- docker/login-action v3 -> v4
- docker/build-push-action v6 -> v7
- codecov/codecov-action v5 -> v7
- peter-evans/create-pull-request v7 -> v8

codecov/test-results-action (already replaced by codecov-action with
report_type: test_results) and pypa/gh-action-pypi-publish@release/v1
(moving branch, still the current major) need no change.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -26,10 +26,10 @@ jobs:
     needs: ci
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
 
       - name: Set up Python
-        uses: actions/setup-python@v6
+        uses: actions/setup-python@v7
         with:
           python-version: "3.13"
 
@@ -47,7 +47,7 @@ jobs:
           hatch build
 
       - name: Upload distributions
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         with:
           name: dist
           path: dist/
@@ -63,7 +63,7 @@ jobs:
       id-token: write
     steps:
       - name: Download distributions
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: dist
           path: dist/
@@ -78,10 +78,10 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v7
 
       - name: Download distributions
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v8
         with:
           name: dist
           path: dist/