chore(deps): 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](https://github.com/actions/upload-artifact/compare/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] <support@github.com>

.github/workflows/flaky-test-detector.yml

@@ -110,7 +110,7 @@ jobs:
 
       - name: Upload flaky test artifacts
         if: always()
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: flaky-test-results
           path: |

.github/workflows/tests.yml

@@ -74,7 +74,7 @@ jobs:
           os: ubuntu
 
       - name: Upload Playwright Report
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         if: ${{ !cancelled() }}
         with:
           name: playwright-report