Add madhead/check-gradle-version to the "Build" section

Author: madhead

README.md

@@ -525,6 +525,7 @@ Set up your GitHub Actions workflow with a specific version of your programming
 - [Setup Brainfuck](https://github.com/fabasoad/setup-brainfuck-action) - Setup brainfuck interpreter.
 - [Publish Go Binaries to GitHub Release Assets](https://github.com/wangyoucao577/go-release-action)
 - [Setup COBOL](https://github.com/fabasoad/setup-cobol-action)
+- [Check Gradle version](https://github.com/madhead/check-gradle-version) - Keep your Gradle version up to date.
 
 ### Database