build: update dependency fetch-mock to v7.3.9

Author: renovate-bot

package.json

@@ -17,7 +17,7 @@
     "babel-preset-env": "1.7.0",
     "coveralls": "3.0.5",
     "del": "5.0.0",
-    "fetch-mock": "7.3.7",
+    "fetch-mock": "7.3.9",
     "gulp": "3.9.1",
     "gulp-babel": "7.0.1",
     "gulp-rename": "1.4.0",

yarn.lock

@@ -3840,10 +3840,10 @@ fetch-ie8@^1.4.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/fetch-ie8/-/fetch-ie8-1.5.0.tgz#f1141c3f96cbc8937aa31b0fbc1a770220fbc15b"
 
-fetch-mock@7.3.7:
-  version "7.3.7"
-  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.3.7.tgz#689fe1a52d0bba05cfbc3413e19e7970d6528a98"
-  integrity sha512-Tl2OEdsLXaXwv+V61s6Ar38FiGrhKGzokLtToiW1Otu6ei0e+g8Apoug5Zc/AFBipAfuiO/4vXV5IP6/lVApBA==
+fetch-mock@7.3.9:
+  version "7.3.9"
+  resolved "https://registry.yarnpkg.com/fetch-mock/-/fetch-mock-7.3.9.tgz#a80fd2a1728f72e0634ef7a9734bc61200096487"
+  integrity sha512-PgsTbiQBNapFz2P2UwDl3gowK3nZqfV4HdyDZ1dI4eTGGH9MLAeBglIPbyDbbNQoGYBOfla6/9uaiq7az2z4Aw==
   dependencies:
     babel-polyfill "^6.26.0"
     core-js "^2.6.9"