Update simplesamlphp/xml-common requirement

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

Updates `simplesamlphp/xml-common` to 3.0.1
- [Release notes](https://github.com/simplesamlphp/xml-common/releases)
- [Commits](simplesamlphp/xml-common@v3.0.0...v3.0.1)

---
updated-dependencies:
- dependency-name: simplesamlphp/xml-common
  dependency-version: 3.0.1
  dependency-type: direct:production
  dependency-group: production-dependencies
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -44,7 +44,7 @@
         "ext-spl": "*",
 
         "simplesamlphp/assert": "~3.0",
-        "simplesamlphp/xml-common": "3.0"
+        "simplesamlphp/xml-common": "3.0.1"
     },
     "require-dev": {
         "simplesamlphp/simplesamlphp-test-framework": "~2.0"