Bump actions/upload-artifact from 6 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 6 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v6...v7)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/full-check.yml

@@ -66,20 +66,20 @@ jobs:
         with:
           report_paths: 'gwt/build/out/**/test/**/reports/TEST-*.xml'
       - name: Upload checkstyle xml for manual review in its own artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         if: always()
         with:
           name: checkstyle-reports-java${{ matrix.java-version }}
           path: 'gwt/build/out/**/checkstyle*.xml'
       - name: Upload test xml files for manual review in its own artifact
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         if: always()
         with:
           name: junit-reports-java${{ matrix.java-version }}
           path: 'gwt/build/out/**/test/**/reports/TEST-*.xml'
 
       - name: On success, upload the release zip
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: gwt-java${{ matrix.java-version }}
           path: 'gwt/build/dist/gwt-*.zip'

.github/workflows/quick-check.yml

@@ -59,7 +59,7 @@ jobs:
             reviewdog -f=checkstyle -filter-mode=diff_context -reporter=github-pr-annotations -level=info < $f
           done
       - name: Upload checkstyle xml for manual review
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         if: ${{ matrix.java-version == '21' }}
         with:
           name: checkstyle-reports-java${{ matrix.java-version }}