Update simplesamlphp/composer-xmlprovider-installer requirement

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:production
  dependency-group: production-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

composer.json

@@ -43,7 +43,7 @@
         "ext-spl": "*",
 
         "simplesamlphp/assert": "~1.9.0",
-        "simplesamlphp/composer-xmlprovider-installer": "~1.0.2"
+        "simplesamlphp/composer-xmlprovider-installer": "~1.1.0"
     },
     "require-dev": {
         "simplesamlphp/simplesamlphp-test-framework": "~1.10.1"