build(deps): bump simplesamlphp/saml2-legacy (simplesamlphp#2512)

Bumps the production-dependencies group with 1 update: [simplesamlphp/saml2-legacy](https://github.com/simplesamlphp/saml2-legacy).


Updates `simplesamlphp/saml2-legacy` from 4.18.1 to 4.19.0
- [Commits](simplesamlphp/saml2-legacy@v4.18.1...v4.19.0)

---
updated-dependencies:
- dependency-name: simplesamlphp/saml2-legacy
  dependency-version: 4.19.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

composer.json

@@ -71,7 +71,7 @@
         "simplesamlphp/assert": "^1.1",
         "simplesamlphp/composer-module-installer": "~1.4.0",
         "simplesamlphp/saml2": "^5@dev",
-        "simplesamlphp/saml2-legacy": "~4.18.1",
+        "simplesamlphp/saml2-legacy": "~4.19.0",
         "simplesamlphp/simplesamlphp-assets-base": "~2.5.2",
         "simplesamlphp/xml-common": "^1.13",
         "simplesamlphp/xml-security": "^1.7",