Bump phpunit/phpunit from 10.5.15 to 10.5.16

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 10.5.15 to 10.5.16.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/10.5.16/ChangeLog-10.5.md)
- [Commits](sebastianbergmann/phpunit@10.5.15...10.5.16)

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

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

composer.json

@@ -24,7 +24,7 @@
  "wp-cli/php-cli-tools": "v0.11.22"
  },
  "require-dev": {
- "phpunit/phpunit": "10.5.15",
+ "phpunit/phpunit": "10.5.16",
  "mockery/mockery": "1.6.11"
  },
  "autoload": {