Chore(deps-dev): Bump phpunit/phpunit from 9.6.9 to 10.2.6

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.9 to 10.2.6.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.2.6/ChangeLog-10.2.md)
- [Commits](https://github.com/sebastianbergmann/phpunit/compare/9.6.9...10.2.6)

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

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

composer.json

@@ -28,7 +28,7 @@
     "kornrunner/blurhash": "^1.2"
   },
   "require-dev": {
-    "phpunit/phpunit": "^9.5",
+    "phpunit/phpunit": "^10.2",
     "nextcloud/coding-standard": "^1.0.0",
     "nextcloud/ocp": "dev-master",
     "vimeo/psalm": "^5.1.0"