Update dependency whatwg-fetch to v3.6.2

Author: renovate-bot

package.json

@@ -47,7 +47,7 @@
     "react-helmet": "5.2.1",
     "react-stripe-elements": "6.1.2",
     "styled-components": "4.4.1",
-    "whatwg-fetch": "3.0.0"
+    "whatwg-fetch": "3.6.2"
   },
   "devDependencies": {
     "@babel/core": "7.7.7",

yarn.lock

@@ -14559,7 +14559,12 @@ whatwg-fetch@2.0.4:
   resolved "https://registry.yarnpkg.com/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz#dde6a5df315f9d39991aa17621853d720b85566f"
   integrity sha512-dcQ1GWpOD/eEQ97k66aiEVpNnapVj90/+R+SXTPYGHpYBBypfKJEQjLrvMZ7YXbKm21gXd4NcuxUTjiv1YtLng==
 
-whatwg-fetch@3.0.0, whatwg-fetch@>=0.10.0:
+whatwg-fetch@3.6.2:
+  version "3.6.2"
+  resolved "https://registry.yarnpkg.com/whatwg-fetch/-/whatwg-fetch-3.6.2.tgz#dced24f37f2624ed0281725d51d0e2e3fe677f8c"
+  integrity sha512-bJlen0FcuU/0EMLrdbJ7zOnW6ITZLrZMIarMUVmdKtsGvZna8vxKYaexICWPfZ8qwf9fzNq+UEIZrnSaApt6RA==
+
+whatwg-fetch@>=0.10.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/whatwg-fetch/-/whatwg-fetch-3.0.0.tgz#fc804e458cc460009b1a2b966bc8817d2578aefb"
   integrity sha512-9GSJUgz1D4MfyKU7KRqwOjXCXTqWdFNvEr7eUBYchQiVc744mqK/MzXPNR2WsPkmkOa4ywfg8C2n8h+13Bey1Q==