Update GitHub Artifact Actions to v7

Author: renovate[bot]

.github/workflows/ci.yml

@@ -60,7 +60,7 @@ jobs:
         run: tar cf targets.tar target project/target
 
       - name: Upload target directories
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v7
         with:
           name: target-${{ matrix.os }}-${{ matrix.scala }}-${{ matrix.java }}
           path: targets.tar