Merge pull request git-for-windows#3387 from gitgitgadget/cb/ci-use-upload-artifacts-v1

ci: use upload-artifacts v1 for dockerized jobs

Author: dscho

.github/workflows/main.yml

@@ -270,7 +270,7 @@ jobs:
       if: failure()
     - name: Upload failed tests' directories
       if: failure() && env.FAILED_TEST_ARTIFACTS != ''
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v1
       with:
         name: failed-tests-${{matrix.vector.jobname}}
         path: ${{env.FAILED_TEST_ARTIFACTS}}