Update wp-cli/wp-cli-tests requirement from ^4.3.7 to ^5.0.0

Updates the requirements on [wp-cli/wp-cli-tests](https://github.com/wp-cli/wp-cli-tests) to permit the latest version.
- [Release notes](https://github.com/wp-cli/wp-cli-tests/releases)
- [Commits](wp-cli/wp-cli-tests@v4.3.7...v5.0.0)

---
updated-dependencies:
- dependency-name: wp-cli/wp-cli-tests
  dependency-version: 5.0.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -25,7 +25,7 @@
         "wp-cli/entity-command": "^1.3 || ^2",
         "wp-cli/language-command": "^2.0",
         "wp-cli/scaffold-command": "^1.2 || ^2",
-        "wp-cli/wp-cli-tests": "^4.3.7"
+        "wp-cli/wp-cli-tests": "^5.0.0"
     },
     "config": {
         "process-timeout": 7200,