chore(deps-dev): bump @types/node-fetch from 2.6.1 to 2.6.4 (#442)

Bumps [@types/node-fetch](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node-fetch) from 2.6.1 to 2.6.4.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node-fetch)

---
updated-dependencies:
- dependency-name: "@types/node-fetch"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -58,7 +58,7 @@
     "@rollup/plugin-terser": "^0.4.3",
     "@rollup/plugin-typescript": "^11.1.1",
     "@types/mocha": "^8.2.1",
-    "@types/node-fetch": "^2.6.1",
+    "@types/node-fetch": "^2.6.4",
     "bignumber.js": "^9.0.1",
     "coveralls": "^3.1.1",
     "expect": "^29.5.0",