Bump cross-env from 6.0.3 to 7.0.2 in /frontend

Bumps [cross-env](https://github.com/kentcdodds/cross-env) from 6.0.3 to 7.0.2.
- [Release notes](https://github.com/kentcdodds/cross-env/releases)
- [Changelog](https://github.com/kentcdodds/cross-env/blob/master/CHANGELOG.md)
- [Commits](kentcdodds/cross-env@v6.0.3...v7.0.2)

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

Author: dependabot-preview[bot]

frontend/package-lock.json

@@ -21,7 +21,7 @@
     "@babel/core": "^7.11.6",
     "@babel/preset-env": "^7.12.0",
     "babel-loader": "^8.1.0",
-    "cross-env": "^6.0.3",
+    "cross-env": "^7.0.2",
     "css-loader": "^2.1.1",
     "file-loader": "^3.0.1",
     "node-sass": "^4.14.1",

frontend/package.json

@@ -1831,11 +1831,11 @@ create-hmac@^1.1.0, create-hmac@^1.1.2:
     create-hash "^1.1.0"
     inherits "^2.0.1"
 
-cross-env@^6.0.3:
-  version "6.0.3"
-  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-6.0.3.tgz#4256b71e49b3a40637a0ce70768a6ef5c72ae941"
+cross-env@^7.0.2:
+  version "7.0.2"
+  resolved "https://registry.yarnpkg.com/cross-env/-/cross-env-7.0.2.tgz#bd5ed31339a93a3418ac4f3ca9ca3403082ae5f9"
   dependencies:
-    cross-spawn "^7.0.0"
+    cross-spawn "^7.0.1"
 
 cross-spawn@^3.0.0:
   version "3.0.1"
@@ -1854,9 +1854,9 @@ cross-spawn@^6.0.0, cross-spawn@^6.0.5:
     shebang-command "^1.2.0"
     which "^1.2.9"
 
-cross-spawn@^7.0.0:
-  version "7.0.1"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.1.tgz#0ab56286e0f7c24e153d04cc2aa027e43a9a5d14"
+cross-spawn@^7.0.1:
+  version "7.0.3"
+  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-7.0.3.tgz#f73a85b9d5d41d045551c177e2882d4ac85728a6"
   dependencies:
     path-key "^3.1.0"
     shebang-command "^2.0.0"