Fix c-check CI job

Author: soutaro

.github/workflows/c-check.yml

@@ -16,8 +16,6 @@ jobs:
           bundler-cache: none
       - name: Set working directory as safe
         run: git config --global --add safe.directory $(pwd)
-      - name: Set up permission
-        run: chmod -R o-w /opt/hostedtoolcache/Ruby
       - name: Install dependencies
         run: |
           sudo apt-get update