fix phpunit badge

Author: michalsn

README.md

@@ -1,6 +1,6 @@
 # CodeIgniter 4 Development
 
-[![PHPUnit](https://github.com/codeigniter4/CodeIgniter4/workflows/PHPUnit/badge.svg)](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-phpunit.yml)
+[![PHPUnit](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-phpunit.yml/badge.svg)](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-phpunit.yml)
 [![PHPStan](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-phpstan.yml/badge.svg)](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-phpstan.yml)
 [![Psalm](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-psalm.yml/badge.svg)](https://github.com/codeigniter4/CodeIgniter4/actions/workflows/test-psalm.yml)
 [![Coverage Status](https://coveralls.io/repos/github/codeigniter4/CodeIgniter4/badge.svg?branch=develop)](https://coveralls.io/github/codeigniter4/CodeIgniter4?branch=develop)