Update php-jwt as much as possible and ignore security advisory

Author: Mark Williams

api/composer.json

@@ -16,7 +16,7 @@
   "require": {
     "apereo/phpcas": "1.6.1",
     "ezyang/htmlpurifier": "4.12.0",
-    "firebase/php-jwt": "6.0.0",
+    "firebase/php-jwt": "^6.0.0",
     "jdorn/sql-formatter": "1.2.9",
     "mpdf/mpdf": "8.1.2",
     "ralouphie/getallheaders": "2.0.5",
@@ -44,6 +44,9 @@
   "config": {
     "platform": {
       "php": "7.3"
+    },
+    "audit": {
+      "ignore": ["PKSA-y2cr-5h3j-g3ys"]
     }
   }
 }