Bump node-fetch from 2.6.1 to 2.6.7 in /src/OnlineSDK

Bumps [node-fetch](https://github.com/node-fetch/node-fetch) from 2.6.1 to 2.6.7.
- [Release notes](https://github.com/node-fetch/node-fetch/releases)
- [Commits](node-fetch/node-fetch@v2.6.1...v2.6.7)

---
updated-dependencies:
- dependency-name: node-fetch
  dependency-type: direct:development
...

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

Author: dependabot[bot]

src/OnlineSDK/package.json

@@ -48,7 +48,7 @@
         "jest": "^23.6.0",
         "jest-junit": "^5.2.0",
         "lint-staged": "^7.3.0",
-        "node-fetch": "2.6.1",
+        "node-fetch": "2.6.7",
         "prettier": "^1.15.3",
         "react-test-renderer": "^16.4.2",
         "semver": "^5.6.0",