chore(deps): bump axios from 0.20.0 to 0.21.0

Bumps [axios](https://github.com/axios/axios) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.20.0...v0.21.0)

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

package.json

@@ -75,7 +75,7 @@
         "yorkie": "^2.0.0"
     },
     "dependencies": {
-        "axios": "0.20.0",
+        "axios": "0.21.0",
         "balloon-css": "^1.0.3",
         "promise-polyfill": "8.2.0"
     }

yarn.lock

@@ -1803,10 +1803,10 @@ aws4@^1.8.0:
   resolved "https://registry.yarnpkg.com/aws4/-/aws4-1.8.0.tgz#f0e003d9ca9e7f59c7a508945d7b2ef9a04a542f"
   integrity sha512-ReZxvNHIOv88FlT7rxcXIIC0fPt4KZqZbOlivyWtXLt8ESx84zd3kMC6iK5jVeS2qt+g7ftS7ye4fi06X5rtRQ==
 
-axios@0.20.0:
-  version "0.20.0"
-  resolved "https://registry.yarnpkg.com/axios/-/axios-0.20.0.tgz#057ba30f04884694993a8cd07fa394cff11c50bd"
-  integrity sha512-ANA4rr2BDcmmAQLOKft2fufrtuvlqR+cXNNinUmvfeSNCOF98PZL+7M/v1zIdGo7OLjEA9J2gXJL+j4zGsl0bA==
+axios@0.21.0:
+  version "0.21.0"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.21.0.tgz#26df088803a2350dff2c27f96fef99fe49442aca"
+  integrity sha512-fmkJBknJKoZwem3/IKSSLpkdNXZeBu5Q7GA/aRsr2btgrptmSCxi2oFjZHqGdK9DoTil9PIHlPIZw2EcRJXRvw==
   dependencies:
     follow-redirects "^1.10.0"