build(deps): bump cross-env from 6.0.2 to 6.0.3 in /backend

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](kentcdodds/cross-env@v6.0.2...v6.0.3)

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

backend/package.json

@@ -53,7 +53,7 @@
     "bcryptjs": "~2.4.3",
     "cheerio": "~1.0.0-rc.3",
     "cors": "~2.8.5",
-    "cross-env": "~6.0.2",
+    "cross-env": "~6.0.3",
     "date-fns": "2.4.1",
     "debug": "~4.1.1",
     "dotenv": "~8.1.0",

backend/yarn.lock

@@ -688,7 +688,7 @@
     core-js "^2.6.5"
     regenerator-runtime "^0.13.2"
 
-"@babel/runtime@^7.0.0", "@babel/runtime@^7.5.5", "@babel/runtime@^7.6.2":
+"@babel/runtime@^7.0.0", "@babel/runtime@^7.5.5":
   version "7.6.2"
   resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.6.2.tgz#c3d6e41b304ef10dcf13777a33e7694ec4a9a6dd"
   integrity sha512-EXxN64agfUqqIGeEjI5dL5z0Sw0ZwWo1mLTi4mQowCZ42O59b7DRpZAnTC6OqdF28wMBMFKNb/4uFGrVaigSpg==
@@ -2626,12 +2626,11 @@ create-error-class@^3.0.0:
   dependencies:
     capture-stack-trace "^1.0.0"
 
-cross-env@~6.0.2:
-  version "6.0.2"
-  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-6.0.2.tgz#2ec3c4b9b90cc074fed375415fc229cb7d6ce612"
-  integrity sha512-lA44HlqWCzrv7/l2pY3sfLDvMhXXhx8oztvD6rg34PdCIcP0yk77UwOL2nacsZXlrzPUMtbfagVbK6Itx8pwng==
+cross-env@~6.0.3:
+  version "6.0.3"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-6.0.3.tgz#4256b71e49b3a40637a0ce70768a6ef5c72ae941"
+  integrity sha512-+KqxF6LCvfhWvADcDPqo64yVIB31gv/jQulX2NGzKS/g3GEVz6/pt4wjHFtFWsHMddebWD/sDthJemzM4MaAag==
   dependencies:
-    "@babel/runtime" "^7.6.2"
     cross-spawn "^7.0.0"
 
 cross-fetch@2.2.2: