CI: Fix artifact-name in case of failure (#19)

Matrix jobs cannot share the same artifact-name

Author: snazy

.github/workflows/benchmarks-main.yml

@@ -63,7 +63,7 @@ jobs:
         uses: actions/upload-artifact@v4
         if: failure()
         with:
-          name: test-results
+          name: test-results-${{ matrix.java-version }}
           path: |
             **/build/reports/*
             **/build/test-results/*

.github/workflows/iceberg-catalog-migrator-main.yml

@@ -63,7 +63,7 @@ jobs:
         uses: actions/upload-artifact@v4
         if: failure()
         with:
-          name: test-results
+          name: test-results-${{ matrix.java-version }}
           path: |
             **/build/reports/*
             **/build/test-results/*