chore(actions): bump actions/upload-artifact from 4 to 7

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 4 to 7.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v4...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>

Author: dependabot[bot]

.github/workflows/docker-readme-validation.yml

@@ -404,7 +404,7 @@ jobs:
           echo "  </testsuites>" >> docker-integration-results.xml
 
       - name: Upload JUnit XML results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ !cancelled() }}
         with:
           name: docker-integration-junit

.github/workflows/e2e-tests.yml

@@ -102,15 +102,15 @@ jobs:
           CI: true
 
       - name: Upload Playwright report
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ !cancelled() }}
         with:
           name: playwright-report
           path: playwright-report/
           retention-days: 14
 
       - name: Upload test results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v7
         if: ${{ !cancelled() }}
         with:
           name: test-results