Bump actions/upload-artifact from 2 to 4

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 2 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v2...v4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.linux.temurin.current.yml

@@ -18,13 +18,13 @@ jobs:
       - name: Build
         run: ./.github/workflows/run-with-xvfb.sh mvn --errors clean verify site
       - name: Upload video
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: test-video
           path: test-suite.webm
       - name: Upload test logs
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: test-logs

.github/workflows/main.linux.temurin.lts.yml

@@ -18,13 +18,13 @@ jobs:
       - name: Build
         run: ./.github/workflows/run-with-xvfb.sh mvn --errors clean verify site
       - name: Upload video
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: test-video
           path: test-suite.webm
       - name: Upload test logs
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         if: ${{ always() }}
         with:
           name: test-logs