Update thepay/api-client requirement from ^2.0.0 to ^2.2.1 (#106)

Updates the requirements on [thepay/api-client](https://github.com/ThePay/api-client) to permit the latest version.
- [Release notes](https://github.com/ThePay/api-client/releases)
- [Commits](ThePay/api-client@v2.0.0...v2.2.1)

---
updated-dependencies:
- dependency-name: thepay/api-client
  dependency-version: 2.2.1
  dependency-type: direct:production
...

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composer.json

@@ -12,7 +12,7 @@
     "php": "^8.2",
     "nette/di": "^3.2.0",
     "nette/schema": "^1.3.0",
-    "thepay/api-client": "^2.0.0"
+    "thepay/api-client": "^2.2.1"
   },
   "require-dev": {
     "contributte/phpstan": "~0.3.1",