Bump axios from 0.18.1 to 0.19.0 in /frontend

Bumps [axios](https://github.com/axios/axios) from 0.18.1 to 0.19.0.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](axios/axios@v0.18.1...v0.19.0)

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

Author: dependabot-preview[bot]

frontend/package-lock.json

@@ -6,7 +6,7 @@
     "not ie <= 8"
   ],
   "dependencies": {
-    "axios": "^0.18.1",
+    "axios": "^0.19.0",
     "bootswatch": "^4.3.1",
     "es6-promise": "^4.2.8",
     "flatpickr": "^4.6.3",

frontend/package.json

@@ -617,9 +617,9 @@ autoprefixer@^9.6.1:
     postcss "^7.0.17"
     postcss-value-parser "^4.0.0"
 
-axios@^0.18.1:
-  version "0.18.1"
-  resolved "https://registry.yarnpkg.com/axios/-/axios-0.18.1.tgz#ff3f0de2e7b5d180e757ad98000f1081b87bcea3"
+axios@^0.19.0:
+  version "0.19.0"
+  resolved "https://registry.yarnpkg.com/axios/-/axios-0.19.0.tgz#8e09bff3d9122e133f7b8101c8fbdd00ed3d2ab8"
   dependencies:
     follow-redirects "1.5.10"
     is-buffer "^2.0.2"