Bump node-fetch and isomorphic-fetch

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) to 2.6.7 and updates ancestor dependency [isomorphic-fetch](https://github.com/matthew-andrews/isomorphic-fetch). These dependencies need to be updated together.


Updates `node-fetch` from 1.7.3 to 2.6.7
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@1.7.3...v2.6.7)

Updates `isomorphic-fetch` from 2.2.1 to 3.0.0
- [Release notes](https://github.com/matthew-andrews/isomorphic-fetch/releases)
- [Commits](matthew-andrews/isomorphic-fetch@v2.2.1...v3.0.0)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: indirect
- dependency-name: isomorphic-fetch
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

amplify/backend/function/S3Trigger984fb593/src/package-lock.json

@@ -7,6 +7,6 @@
     "aws-appsync": "^3.0.2",
     "dotenv": "^8.2.0",
     "graphql-tag": "^2.10.1",
-    "isomorphic-fetch": "^2.2.1"
+    "isomorphic-fetch": "^3.0.0"
   }
 }