Update php-stubs/wordpress-stubs requirement from 6.9.* to 7.0.*

Updates the requirements on [php-stubs/wordpress-stubs](https://github.com/php-stubs/wordpress-stubs) to permit the latest version.
- [Release notes](https://github.com/php-stubs/wordpress-stubs/releases)
- [Commits](php-stubs/wordpress-stubs@v6.9.0...v7.0.0)

---
updated-dependencies:
- dependency-name: php-stubs/wordpress-stubs
  dependency-version: 7.0.0
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -36,7 +36,7 @@
         "phpunit/phpunit": "^8.0 || ^9.0",
         "phpstan/phpstan": "^2.0",
         "szepeviktor/phpstan-wordpress": "^2.0",
-        "php-stubs/wordpress-stubs": "6.9.*",
+        "php-stubs/wordpress-stubs": "7.0.*",
         "roots/wordpress": "6.9.*",
         "wp-phpunit/wp-phpunit": "6.9.*",
         "symfony/var-dumper": "*",