build(deps): bump form-data from 4.0.5 to 4.0.6

Bumps [form-data](https://github.com/form-data/form-data) from 4.0.5 to 4.0.6.
- [Changelog](https://github.com/form-data/form-data/blob/master/CHANGELOG.md)
- [Commits](form-data/form-data@v4.0.5...v4.0.6)

---
updated-dependencies:
- dependency-name: form-data
  dependency-version: 4.0.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/mailgun/package.json

@@ -22,7 +22,7 @@
   ],
   "dependencies": {
     "@openfn/language-common": "workspace:*",
-    "form-data": "^4.0.4",
+    "form-data": "^4.0.6",
     "mailgun.js": "^9.2.0",
     "sync-request": "^6.0.0"
   },