Update phpstan/phpstan requirement from 2.1.39 to 2.1.40 (#614)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -32,7 +32,7 @@
         "doctrine/mongodb-odm": "^1.3.0 || ^2.0.0",
         "doctrine/orm": "^2.14 || ^3",
         "fig/log-test": "^1",
-        "phpstan/phpstan": "2.1.39",
+        "phpstan/phpstan": "2.1.40",
         "phpunit/phpunit": "^9.6.13 || ^12.4",
         "psr/log": "^1.1 || ^2 || ^3",
         "symfony/cache": "^5.4 || ^6.3 || ^7 || ^8",