deps: update robrichards/xmlseclibs requirement (#19)

Updates the requirements on [robrichards/xmlseclibs](https://github.com/robrichards/xmlseclibs) to permit the latest version.
- [Release notes](https://github.com/robrichards/xmlseclibs/releases)
- [Changelog](https://github.com/robrichards/xmlseclibs/blob/master/CHANGELOG.txt)
- [Commits](robrichards/xmlseclibs@3.1.5...4.0.1)

---
updated-dependencies:
- dependency-name: robrichards/xmlseclibs
  dependency-version: 4.0.1
  dependency-type: direct:production
...

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Author: dependabot[bot]

composer.json

@@ -39,7 +39,7 @@
   "require": {
     "php": ">=8.2",
     "php-curl-class/php-curl-class": "^11.0.0 || ^12.0.0 || ^13.0.0",
-    "robrichards/xmlseclibs": "^3.1.5",
+    "robrichards/xmlseclibs": "^3.1.5 || ^4.0.0",
     "ext-mbstring": "*",
     "ext-json": "*",
     "ext-dom": "*",