⬆ Bump actions/upload-artifact from 5 to 6

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 5 to 6.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v5...v6)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-docs.yml

@@ -72,7 +72,7 @@ jobs:
         run: python ./scripts/docs.py verify-readme
       - name: Build Docs
         run: python ./scripts/docs.py build
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         with:
           name: docs-site
           path: ./site/**

.github/workflows/test.yml

@@ -76,7 +76,7 @@ jobs:
           COVERAGE_FILE: coverage/.coverage.${{ runner.os }}-py${{ matrix.python-version }}
           CONTEXT: ${{ runner.os }}-py${{ matrix.python-version }}
       - name: Store coverage files
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-${{ matrix.python-version }}-${{ matrix.anyio-version }}
           path: coverage
@@ -111,7 +111,7 @@ jobs:
       - run: coverage combine coverage
       - run: coverage html --title "Coverage for ${{ github.sha }}"
       - name: Store coverage HTML
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: coverage-html
           path: htmlcov