update README.md (ruff 0.15.0)

Author: install-pinned bot

README.md

@@ -20,7 +20,7 @@ In your GitHub Actions workflow, use this action like so:
 
 ```yaml
       - name: Install ruff from PyPI
-        uses: install-pinned/ruff@5ff1deac450853aceee85bd42444f8d7b10f38a1  # 0.14.14
+        uses: install-pinned/ruff@bed80ad127767d8f15d5afec7e14e9f2480de149  # 0.15.0
 ```
 
 You can [set up Dependabot](https://docs.github.com/en/code-security/dependabot/working-with-dependabot/keeping-your-actions-up-to-date-with-dependabot#example-dependabotyml-file-for-github-actions)