Build(deps): 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/main.yml

@@ -42,7 +42,7 @@ jobs:
       id: version
       run: python ./tools/get-version.py >> $GITHUB_OUTPUT
     - name: Upload artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: dist
         path: dist
@@ -93,7 +93,7 @@ jobs:
       run: python -m tox
 
     - name: Store coverage data
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       if: "!endsWith(matrix.os, 'windows')"
       with:
         name: coverage-python-${{ matrix.python-version }}
@@ -182,7 +182,7 @@ jobs:
       run: |
         pandoc --wrap=preserve -o release-notes.md release-notes.rst
     - name: Upload artifacts
-      uses: actions/upload-artifact@v5
+      uses: actions/upload-artifact@v6
       with:
         name: release-notes.md
         path: release-notes.md