build(deps-dev): bump @babel/cli from 7.6.2 to 7.6.3 in /backend

Bumps [@babel/cli](https://github.com/babel/babel) from 7.6.2 to 7.6.3.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/babel/compare/v7.6.2...v7.6.3)

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

backend/package.json

@@ -105,7 +105,7 @@
     "xregexp": "^4.2.4"
   },
   "devDependencies": {
-    "@babel/cli": "~7.6.2",
+    "@babel/cli": "~7.6.3",
     "@babel/core": "~7.6.2",
     "@babel/node": "~7.6.3",
     "@babel/plugin-proposal-throw-expressions": "^7.2.0",

backend/yarn.lock

@@ -14,10 +14,10 @@
   resolved "https://registry.yarnpkg.com/@apollographql/graphql-playground-html/-/graphql-playground-html-1.6.24.tgz#3ce939cb127fb8aaa3ffc1e90dff9b8af9f2e3dc"
   integrity sha512-8GqG48m1XqyXh4mIZrtB5xOhUwSsh1WsrrsaZQOEYYql3YN9DEu9OOSg0ILzXHZo/h2Q74777YE4YzlArQzQEQ==
 
-"@babel/cli@~7.6.2":
-  version "7.6.2"
-  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.6.2.tgz#4ce8b5b4b2e4b4c1b7bd841cec62085e2dfc4465"
-  integrity sha512-JDZ+T/br9pPfT2lmAMJypJDTTTHM9ePD/ED10TRjRzJVdEVy+JB3iRlhzYmTt5YkNgHvxWGlUVnLtdv6ruiDrQ==
+"@babel/cli@~7.6.3":
+  version "7.6.3"
+  resolved "https://registry.yarnpkg.com/@babel/cli/-/cli-7.6.3.tgz#1b0c62098c8a5e01e4a4a59a52cba9682e7e0906"
+  integrity sha512-kWKOEeuylpa781yCeA5//eEx1u3WtLZqbi2VWXLKmb3QDPb5T2f7Yk311MK7bvvjR70dluAeiu4VXXsG1WwJsw==
   dependencies:
     commander "^2.8.1"
     convert-source-map "^1.1.0"
@@ -27,7 +27,7 @@
     mkdirp "^0.5.1"
     output-file-sync "^2.0.0"
     slash "^2.0.0"
-    source-map "^0.5.0"
+    source-map "^0.6.1"
   optionalDependencies:
     chokidar "^2.1.8"