Update mikepenz/action-junit-report action to v6

Author: renovate[bot]

.github/workflows/build.yml

@@ -55,7 +55,7 @@ jobs:
                 run: ./mvnw --batch-mode clean install
 
             -   name: Publish Test Report
-                uses: mikepenz/action-junit-report@v5
+                uses: mikepenz/action-junit-report@v6
                 if: success() || failure() # always run even if the previous step fails
                 with:
                     report_paths: '**/target/*/TEST-*.xml'