Fix quote typo.

Author: jonsimantov

.github/workflows/integration_tests.yml

@@ -180,7 +180,7 @@ jobs:
           MERGE_BASE=$(git merge-base "origin/${HEAD_REF}" "origin/${BASE_REF}" || true)
           # If origin/<branch> is no longer valid, then just run all tests.
           if [[ -n "${MERGE_BASE}" ]]; then
-            echo '::warning ::Auto-diff origin/${HEAD_REF}..${MERGE_BASE}"
+            echo "::warning ::Auto-diff origin/${HEAD_REF}..${MERGE_BASE}"
             git diff --name-only "origin/${HEAD_REF}..${MERGE_BASE}"
             TEST_MATRIX_PARAM="--auto_diff origin/${HEAD_REF}..${MERGE_BASE}"
           fi