chore(github-actions): bump actions/upload-artifact from 5 to 6 (#1481)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/lapis-docs.yml

@@ -79,7 +79,7 @@ jobs:
       - name: Run E2E test
         run: npm run e2e
 
-      - uses: actions/upload-artifact@v5
+      - uses: actions/upload-artifact@v6
         if: ${{ failure() }}
         with:
           name: playwright-report

.github/workflows/lapis.yml

@@ -149,7 +149,7 @@ jobs:
 
       - name: Upload logs
         if: ${{ always() }}
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: logs
           path: lapis/e2e-logs