build(deps): bump firebase/php-jwt from 6.5.0 to 6.8.0

Bumps [firebase/php-jwt](https://github.com/firebase/php-jwt) from 6.5.0 to 6.8.0.
- [Release notes](https://github.com/firebase/php-jwt/releases)
- [Changelog](https://github.com/firebase/php-jwt/blob/main/CHANGELOG.md)
- [Commits](https://github.com/firebase/php-jwt/compare/v6.5.0...v6.8.0)

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

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

composer.lock

@@ -65,16 +65,16 @@
         },
         {
             "name": "firebase/php-jwt",
-            "version": "v6.5.0",
+            "version": "v6.8.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/firebase/php-jwt.git",
-                "reference": "e94e7353302b0c11ec3cfff7180cd0b1743975d2"
+                "reference": "48b0210c51718d682e53210c24d25c5a10a2299b"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/e94e7353302b0c11ec3cfff7180cd0b1743975d2",
-                "reference": "e94e7353302b0c11ec3cfff7180cd0b1743975d2",
+                "url": "https://api.github.com/repos/firebase/php-jwt/zipball/48b0210c51718d682e53210c24d25c5a10a2299b",
+                "reference": "48b0210c51718d682e53210c24d25c5a10a2299b",
                 "shasum": ""
             },
             "require": {
@@ -122,9 +122,9 @@
             ],
             "support": {
                 "issues": "https://github.com/firebase/php-jwt/issues",
-                "source": "https://github.com/firebase/php-jwt/tree/v6.5.0"
+                "source": "https://github.com/firebase/php-jwt/tree/v6.8.0"
             },
-            "time": "2023-05-12T15:47:07+00:00"
+            "time": "2023-06-20T16:45:35+00:00"
         }
     ],
     "packages-dev": [