composer(deps-dev): bump psalm/plugin-phpunit from 0.15.1 to 0.16.1

Bumps [psalm/plugin-phpunit](https://github.com/psalm/psalm-plugin-phpunit) from 0.15.1 to 0.16.1.
- [Release notes](https://github.com/psalm/psalm-plugin-phpunit/releases)
- [Commits](psalm/psalm-plugin-phpunit@0.15.1...0.16.1)

---
updated-dependencies:
- dependency-name: psalm/plugin-phpunit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

composer.json

@@ -33,7 +33,7 @@
     "phpstan/phpstan-phpunit": "~0.12.22",
     "phpstan/phpstan-strict-rules": "~0.12.10",
     "phpunit/phpunit": "^8.5.19",
-    "psalm/plugin-phpunit": "~0.15.1",
+    "psalm/plugin-phpunit": "~0.16.1",
     "vimeo/psalm": "^4.7.0"
   },
   "config": {