fix(deps): update dependency mailparser to v2.7.6

Author: renovate-bot

package-lock.json

@@ -30,7 +30,7 @@
     "jscpd-badge-reporter": "1.1.3",
     "jsonwebtoken": "8.5.1",
     "knex": "0.16.3",
-    "mailparser": "2.7.5",
+    "mailparser": "2.7.6",
     "make-error": "1.3.5",
     "moment": "2.24.0",
     "nodemailer": "6.3.1",