chore(deps-dev): Update veewee/xml requirement from ^2.6 to ^3.1

Updates the requirements on [veewee/xml](https://github.com/veewee/xml) to permit the latest version.
- [Release notes](https://github.com/veewee/xml/releases)
- [Commits](veewee/xml@2.6.0...3.1.0)

---
updated-dependencies:
- dependency-name: veewee/xml
  dependency-type: direct:development
...

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

composer.json

@@ -36,7 +36,7 @@
         "symfony/http-client": "^6.1",
         "symfony/routing": "^6.1",
         "symfony/security-bundle": "^6.1",
-        "veewee/xml": "^2.6"
+        "veewee/xml": "^3.1"
     },
     "suggest": {
         "loophp/unaltered-psr-http-message-bridge-bundle": "A drop-in replacement for symfony/psr-http-message-bridge, that does not alter query parameters.",