Bump firebase/php-jwt from 4.0.0 to 6.2.0 in /3rdparty

Bumps [firebase/php-jwt](https://github.com/firebase/php-jwt) from 4.0.0 to 6.2.0.
- [Release notes](https://github.com/firebase/php-jwt/releases)
- [Commits](firebase/php-jwt@v4.0.0...v6.2.0)

---
updated-dependencies:
- dependency-name: firebase/php-jwt
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

3rdparty/composer.json

@@ -5,6 +5,6 @@
     },
     "require": {
         "onelogin/php-saml": "^3.0",
-        "firebase/php-jwt": "^4.0"
+        "firebase/php-jwt": "^6.2"
     }
 }