ci: add examples label to labeler.yml

[kurosakishigure]

Summary of Changes

1. Commit message(if applicable)

Description

• What is the purpose of this PR?
  • (if applicable)
• What problem does it solve?
  • (if applicable)
• Are there any breaking changes or backwards compatibility issues?
  • (if applicable)

Related Issue

• Closes #number(if applicable)

Checklist

• I have read and followed the guidelines in CONTRIBUTING.md
• I have already updated the related examples accordingly(if applicable)
• I have written or updated relevant docs(if applicable)
• I have already updated the related CI accordingly(if applicable)
• I have added or updated tests to cover my changes(if applicable)
• I have already updated the related build system accordingly(if applicable)
• I have reviewed my code for any potential issues

Additional Notes

(if applicable)