bump artifact upload

Author: dirkbolte

.github/workflows/build-and-test.yml

@@ -66,10 +66,11 @@ jobs:
           fi
 
       - name: Upload Jacoco coverage report
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: jacoco-report
           path: build/reports/jacoco/
+          merge-multiple: true
 
   archive:
     name: Archive job results
@@ -93,3 +94,4 @@ jobs:
           name: jars
           path: |
             build/libs/*.jar
+          merge-multiple: true