fix: upgrade @parse/simple-mailgun-adapter from 1.1.0 to 1.2.0 (#7109)

Snyk has created this PR to upgrade @parse/simple-mailgun-adapter from 1.1.0 to 1.2.0.

See this package in npm:
https://www.npmjs.com/package/@parse/simple-mailgun-adapter

See this project in Snyk:
https://app.snyk.io/org/acinader/project/8c1a9edb-c8f5-4dc1-b221-4d6030a323eb?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -26,7 +26,7 @@
     "@parse/fs-files-adapter": "1.2.0",
     "@parse/push-adapter": "3.4.0",
     "@parse/s3-files-adapter": "1.6.0",
-    "@parse/simple-mailgun-adapter": "1.1.0",
+    "@parse/simple-mailgun-adapter": "1.2.0",
     "apollo-server-express": "2.19.0",
     "bcryptjs": "2.4.3",
     "body-parser": "1.19.0",