build(deps-dev): bump phpunit/phpunit from 10.5.26 to 11.5.0

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 10.5.26 to 11.5.0.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/11.5.0/ChangeLog-11.5.md)
- [Commits](sebastianbergmann/phpunit@10.5.26...11.5.0)

---
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

@@ -31,7 +31,7 @@
   },
   "require-dev": {
     "lunr/halo": "~0.10.0",
-    "phpunit/phpunit": "~10.0",
+    "phpunit/phpunit": "~11.5",
     "theseer/autoload": "~1.0",
     "phing/phing": "~3.0",
     "phpstan/phpstan": "^1.2.0",