Bump node-fetch from 2.6.0 to 2.6.1 in /functions

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)
- [Commits](node-fetch/node-fetch@v2.6.0...v2.6.1)

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

functions/yarn.lock

@@ -2259,9 +2259,9 @@ node-abi@^2.7.0:
     semver "^5.4.1"
 
 node-fetch@^2.2.0, node-fetch@^2.3.0, node-fetch@^2.6.0:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.0.tgz#e633456386d4aa55863f676a7ab0daa8fdecb0fd"
-  integrity sha512-8dG4H5ujfvFiqDmVu9fQ5bOHUC15JMjMY/Zumv26oOvvVJjM67KF8koCWIabKQ1GJIa9r2mMZscBq/TbdOcmNA==
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.1.tgz#045bd323631f76ed2e2b55573394416b639a0052"
+  integrity sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==
 
 node-forge@^0.7.6:
   version "0.7.6"