Update simplesamlphp/assert requirement (#45)

Updates the requirements on [simplesamlphp/assert](https://github.com/simplesamlphp/assert) to permit the latest version.

Updates `simplesamlphp/assert` to 2.0.2
- [Release notes](https://github.com/simplesamlphp/assert/releases)
- [Commits](simplesamlphp/assert@v1.9.0...v2.0.2)

---
updated-dependencies:
- dependency-name: simplesamlphp/assert
  dependency-version: 2.0.2
  dependency-type: direct:production
  dependency-group: production-dependencies
...

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Author: dependabot[bot]

composer.json

@@ -37,7 +37,7 @@
         "php": "^8.3",
         "ext-pdo": "*",
 
-        "simplesamlphp/assert": "^1.9",
+        "simplesamlphp/assert": "^2.0",
         "simplesamlphp/composer-module-installer": "^1.5",
         "simplesamlphp/saml2": "^6.0",