Bump actions/upload-artifact from 5 to 6 (#9166)

Author: dependabot[bot]

.github/workflows/tests.yaml

@@ -281,7 +281,7 @@ jobs:
         if: >
           always() &&
           (steps.run_tests.outcome == 'success' || steps.run_tests.outcome == 'failure')
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.TEST_ID }}
           path: reports
@@ -291,7 +291,7 @@ jobs:
         if: >
           always() &&
           (steps.run_tests.outcome == 'success' || steps.run_tests.outcome == 'failure')
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: ${{ env.TEST_ID }}_cluster_dumps
           path: test_cluster_dump
@@ -305,7 +305,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Upload
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@v6
         with:
           name: Event File
           path: ${{ github.event_path }}