Bump phpunit/phpunit from 9.6.10 to 9.6.13 (#11095)

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.10 to 9.6.13.
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/9.6.13/ChangeLog-9.6.md)
- [Commits](sebastianbergmann/phpunit@9.6.10...9.6.13)

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

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

Author: dependabot[bot]

composer.json

@@ -21,7 +21,7 @@
 		"automattic/jetpack-config": "^1.15"
 	},
 	"require-dev": {
-		"phpunit/phpunit": "9.6.10",
+		"phpunit/phpunit": "9.6.13",
 		"phpunit/php-code-coverage": "9.2.29",
 		"woocommerce/woocommerce-sniffs": "0.1.3",
 		"phpdocumentor/reflection": "3.0.1",