chore(deps-dev): bump phpunit/phpunit from 9.6.19 to 11.5.1

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.19 to 11.5.1.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.5.1/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@9.6.19...11.5.1)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

composer.json

@@ -53,7 +53,7 @@
   "require-dev": {
     "squizlabs/php_codesniffer": "^3.7.1",
     "roave/security-advisories": "dev-latest",
-    "phpunit/phpunit": "^9",
+    "phpunit/phpunit": "^11",
     "pressbooks/coding-standards": "^1.1"
   },
   "config": {