Update simplesamlphp/composer-module-installer requirement (#10)

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

Updates `simplesamlphp/composer-module-installer` to 1.4.0
- [Release notes](https://github.com/simplesamlphp/composer-module-installer/releases)
- [Commits](simplesamlphp/composer-module-installer@v1.3.2...v1.4.0)

---
updated-dependencies:
- dependency-name: simplesamlphp/composer-module-installer
  dependency-type: direct:production
  dependency-group: production-dependencies
...

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Author: dependabot[bot]

composer.json

@@ -24,7 +24,7 @@
     "require": {
         "php": "^8.1",
         "simplesamlphp/assert": "^1.0",
-        "simplesamlphp/composer-module-installer": "~1.3.2",
+        "simplesamlphp/composer-module-installer": "~1.4.0",
         "simplesamlphp/simplesamlphp": "^2.1.0"
     },
     "require-dev": {