Code Scanning did not raise a alert.

[Hideki-Yoshizawa]

I followed the instruction Step 3: Review and Triage CodeQL Alerts in Exercise: Introduction to CodeQL, but CodeQL did not raise any alert.

[github-actions]

🧰 Skills Exercise Review Needed

This report concerns a GitHub Skills training or exercise. We are moving the complaint to the Skills exercise team to address.

[Hideki-Yoshizawa]

I have found that Step 2: Detect Vulnerabilities in a Pull Request worked well, and I can go to Step 3: Review and Triage.
So there is no issue.