Update simplesamlphp/composer-xmlprovider-installer requirement (#391)

Updates the requirements on [simplesamlphp/composer-xmlprovider-installer](https://github.com/simplesamlphp/composer-xmlprovider-installer) to permit the latest version.

Updates `simplesamlphp/composer-xmlprovider-installer` to 1.1.0
- [Commits](simplesamlphp/composer-xmlprovider-installer@v1.0.2...v1.1.0)

---
updated-dependencies:
- dependency-name: simplesamlphp/composer-xmlprovider-installer
  dependency-version: 1.1.0
  dependency-type: direct:development
  dependency-group: dev-dependencies
...

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Author: dependabot[bot]

composer.json

@@ -40,7 +40,7 @@
 
         "beste/clock": "~3.0.0",
         "mockery/mockery": "~1.6.12",
-        "simplesamlphp/composer-xmlprovider-installer": "~1.0.2",
+        "simplesamlphp/composer-xmlprovider-installer": "~1.1.0",
         "simplesamlphp/simplesamlphp-test-framework": "~1.10.2"
     },
     "suggest": {