Bump wp-phpunit/wp-phpunit from 6.1.1 to 6.7.1

Bumps [wp-phpunit/wp-phpunit](https://github.com/wp-phpunit/wp-phpunit) from 6.1.1 to 6.7.1.
- [Commits](wp-phpunit/wp-phpunit@6.1.1...6.7.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -11,7 +11,7 @@
     "phpunit/phpunit": "9.5.28",
     "wp-coding-standards/wpcs": "^2.3",
     "johnpbloch/wordpress-core": "6.1.1",
-    "wp-phpunit/wp-phpunit": "6.1.1",
+    "wp-phpunit/wp-phpunit": "6.7.1",
     "yoast/phpunit-polyfills": "1.1.0",
     "wp-cli/wp-cli": "*"
   },