Use bash shell for mock check

Author: qdm12

.github/workflows/tests.yml

@@ -55,6 +55,7 @@ jobs:
       - run: go mod download
         shell: bash
       - name: Mocks are up to date
+        shell: bash
         run: |
           grep -lr -E '^// Code generated by MockGen\. DO NOT EDIT\.$' . | xargs -r rm
           ./scripts/mock.gen.sh