Update szepeviktor/phpstan-wordpress requirement from ^1.1 to ^2.0

Updates the requirements on [szepeviktor/phpstan-wordpress](https://github.com/szepeviktor/phpstan-wordpress) to permit the latest version.
- [Release notes](https://github.com/szepeviktor/phpstan-wordpress/releases)
- [Commits](szepeviktor/phpstan-wordpress@v1.1.0...v2.0.1)

---
updated-dependencies:
- dependency-name: szepeviktor/phpstan-wordpress
  dependency-type: direct:development
...

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

composer.json

@@ -22,7 +22,7 @@
     "require-dev": {
         "alleyinteractive/alley-coding-standards": "^2.0",
         "mantle-framework/testkit": "^1.0",
-        "szepeviktor/phpstan-wordpress": "^1.1"
+        "szepeviktor/phpstan-wordpress": "^2.0"
     },
     "config": {
         "allow-plugins": {