[Security] Bump node-fetch from 1.7.3 to 2.6.1

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 1.7.3 to 2.6.1. **This update includes a security fix.**
- [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@1.7.3...v2.6.1)

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

Author: dependabot-preview[bot]

package.json

@@ -75,7 +75,7 @@
     "leaflet": "^1.1.0",
     "loader.js": "^4.2.3",
     "mapbox-gl": "^0.47.0",
-    "node-fetch": "^1.7.2"
+    "node-fetch": "^2.6.1"
   },
   "engines": {
     "node": "^8.11.3",

yarn.lock

@@ -7198,16 +7198,16 @@ no-case@^2.2.0:
   dependencies:
     lower-case "^1.1.1"
 
-node-fetch@^1.3.3, node-fetch@^1.7.2:
+node-fetch@^1.3.3:
   version "1.7.3"
   resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-1.7.3.tgz#980f6f72d85211a5347c6b2bc18c5b84c3eb47ef"
   dependencies:
     encoding "^0.1.11"
     is-stream "^1.0.1"
 
-node-fetch@^2.0.0-alpha.9:
-  version "2.1.2"
-  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.1.2.tgz#ab884e8e7e57e38a944753cec706f788d1768bb5"
+node-fetch@^2.0.0-alpha.9, node-fetch@^2.6.1:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.1.tgz#045bd323631f76ed2e2b55573394416b639a0052"
 
 node-gyp@^3.3.1:
   version "3.7.0"