chore(deps): update dependency cross-env to v7 (#1747)

Co-authored-by: WhiteSource Renovate <renovatebot@gmail.com>

package.json

@@ -96,7 +96,7 @@
         "colorful": "^2.1.0",
         "commander": "^4.0.0",
         "compare-versions": "^3.3.0",
-        "cross-env": "^6.0.0",
+        "cross-env": "^7.0.0",
         "css-loader": "^3.0.0",
         "deep-assign": "^2.0.0",
         "enquire-js": "^0.2.1",