Bump actions/upload-artifact from 3 to 4 (#333)

Bumps [actions/upload-artifact](https://github.com/actions/upload-artifact) from 3 to 4.
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/check-supported-versions.yaml

@@ -50,7 +50,7 @@ jobs:
         run: mvn -nsu -B --quiet -Djacoco.skip=true -Dorg.slf4j.simpleLogger.defaultLogLevel=error --no-transfer-progress clean install --file pom.xml ${{ matrix.flags }}
 
       - name: Upload Maven build artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         if: matrix.java == '11' && matrix.os == 'ubuntu-latest'
         with:
           name: artifact

.github/workflows/openapi-generator.yaml

@@ -39,7 +39,7 @@ jobs:
         run: mvn --no-snapshot-updates --batch-mode --quiet install -DskipTests -Dorg.slf4j.simpleLogger.defaultLogLevel=error
       - run: ls -la  modules/openapi-generator-cli/target
       - name: Upload openapi-generator-cli.jar artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: openapi-generator-cli.jar
           path: modules/openapi-generator-cli/target/openapi-generator-cli.jar
@@ -75,7 +75,7 @@ jobs:
         run: mvn --no-snapshot-updates --batch-mode --quiet --fail-at-end test -Dorg.slf4j.simpleLogger.defaultLogLevel=error
       - name: Publish unit test reports
         if: ${{ always() }}
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: surefire-test-results
           path: '**/surefire-reports/TEST-*.xml'