Bump phpunit/phpunit

Bumps the tools_phpunit_dependencies group with 1 update in the /tools/01_phpunit directory: [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit).


Updates `phpunit/phpunit` from 12.1.0 to 12.1.2
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/12.1.2/ChangeLog-12.1.md)
- [Commits](sebastianbergmann/phpunit@12.1.0...12.1.2)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 12.1.2
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: tools_phpunit_dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tools/01_phpunit/composer.json

@@ -9,7 +9,7 @@
 		"liuggio/fastest": "1.13.0",
 		"phpunit/php-code-coverage": "12.1.2",
 		"phpunit/phpcov": "11.0.0",
-		"phpunit/phpunit": "12.1.0",
+		"phpunit/phpunit": "12.1.3",
 		"roave/security-advisories": "dev-latest",
 		"symfony/browser-kit": "7.2.4",
 		"symfony/phpunit-bridge": "7.2.0"