Bump phpunit/phpunit from 9.5.28 to 9.6.3 (#2087)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.5.28 to 9.6.3.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/main/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.5.28...9.6.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

composer.json

@@ -54,7 +54,7 @@
     "ext-curl": "*"
   },
   "require-dev": {
-    "phpunit/phpunit": "9.5.*",
+    "phpunit/phpunit": "9.6.*",
     "squizlabs/php_codesniffer": "^3.7.1",
     "phpstan/phpstan": "^1.9.16",
     "phpstan/phpstan-doctrine": "^1.3.32",