Disable treating warning as errors (#4559)

Suppress Shellcheck warnings.

.github/workflows/lint-scripts-pr.yml

@@ -35,7 +35,7 @@ jobs:
            for file in ${{ steps.changed-files.outputs.all_changed_files }}; do
              if grep -qE "#\!/" $file; then
 
-                 shellcheck $file
+                 shellcheck --severity=error $file
 
              fi
            done