Update dapphp/radius requirement in the production-dependencies group

Updates the requirements on [dapphp/radius](https://github.com/dapphp/radius) to permit the latest version.

Updates `dapphp/radius` to 3.1.0
- [Release notes](https://github.com/dapphp/radius/releases)
- [Commits](dapphp/radius@v3.0.0...3.1.0)

---
updated-dependencies:
- dependency-name: dapphp/radius
  dependency-version: 3.1.0
  dependency-type: direct:production
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

composer.json

@@ -36,7 +36,7 @@
     "require": {
         "php": "^8.2",
 
-        "dapphp/radius": "~3.0.0",
+        "dapphp/radius": "~3.1.0",
         "simplesamlphp/simplesamlphp": "^2.4.0"
     },
     "require-dev": {