Bump the production-dependencies group with 2 updates

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

Updates `simplesamlphp/assert` to 1.8.1
- [Release notes](https://github.com/simplesamlphp/assert/releases)
- [Commits](simplesamlphp/assert@v1.7.0...v1.8.1)

Updates `simplesamlphp/xml-common` to 1.24.0
- [Release notes](https://github.com/simplesamlphp/xml-common/releases)
- [Commits](simplesamlphp/xml-common@v1.23.2...v1.24.0)

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

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

composer.json

@@ -13,8 +13,8 @@
         "ext-dom": "*",
         "ext-spl": "*",
 
-        "simplesamlphp/assert": "~1.7.0",
-        "simplesamlphp/xml-common": "~1.23.2"
+        "simplesamlphp/assert": "~1.8.1",
+        "simplesamlphp/xml-common": "~1.24.0"
     },
     "require-dev": {
         "simplesamlphp/simplesamlphp-test-framework": "^1.7"