Update phpstan/phpstan requirement from 1.10.11 to 1.10.13 (#223)

Updates the requirements on [phpstan/phpstan](https://github.com/phpstan/phpstan) to permit the latest version.
- [Release notes](https://github.com/phpstan/phpstan/releases)
- [Changelog](https://github.com/phpstan/phpstan/blob/1.11.x/CHANGELOG.md)
- [Commits](phpstan/phpstan@1.10.11...1.10.13)

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

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

composer.json

@@ -22,7 +22,7 @@
   },
   "require-dev": {
     "phpunit/phpunit": "~9",
-    "phpstan/phpstan": "1.10.11"
+    "phpstan/phpstan": "1.10.13"
   },
   "autoload": {
     "classmap": ["lib/Conekta/"]