Bump the symfony group with 2 updates

Updates the requirements on [symfony/ldap](https://github.com/symfony/ldap) and [symfony/security-core](https://github.com/symfony/security-core) to permit the latest version.

Updates `symfony/ldap` to 7.1.6
- [Release notes](https://github.com/symfony/ldap/releases)
- [Changelog](https://github.com/symfony/ldap/blob/7.1/CHANGELOG.md)
- [Commits](symfony/ldap@v6.4.0...v7.1.6)

Updates `symfony/security-core` to 7.1.6
- [Release notes](https://github.com/symfony/security-core/releases)
- [Changelog](https://github.com/symfony/security-core/blob/7.1/CHANGELOG.md)
- [Commits](symfony/security-core@v6.4.0...v7.1.6)

---
updated-dependencies:
- dependency-name: symfony/ldap
  dependency-type: direct:production
  dependency-group: symfony
- dependency-name: symfony/security-core
  dependency-type: direct:production
  dependency-group: symfony
...

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

composer.json

@@ -50,8 +50,8 @@
         "simplesamlphp/simplesamlphp": "^2.2",
         "simplesamlphp/simplesamlphp-module-ldap": "^2.2",
         "symfony/http-foundation": "^6.4",
-        "symfony/ldap": "^6.4",
-        "symfony/security-core": "^6.4"
+        "symfony/ldap": "^7.1",
+        "symfony/security-core": "^7.1"
     },
     "require-dev": {
         "simplesamlphp/simplesamlphp-test-framework": "^1.6.0"