Update phpstan/phpstan requirement from 2.1.39 to 2.1.40

---
updated-dependencies:
- dependency-name: phpstan/phpstan
  dependency-version: 2.1.40
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -23,7 +23,7 @@
 		"squizlabs/php_codesniffer": "3.13.5",
 		"wp-coding-standards/wpcs": "~3.3.0",
 		"phpcompatibility/phpcompatibility-wp": "~2.1.3",
-		"phpstan/phpstan": "2.1.39",
+		"phpstan/phpstan": "2.1.40",
 		"yoast/phpunit-polyfills": "^1.1.0"
 	},
 	"config": {