chore(deps-dev): bump @babel/preset-env from 7.4.5 to 7.7.6

Bumps [@babel/preset-env](https://github.com/babel/babel) from 7.4.5 to 7.7.6.
- [Release notes](https://github.com/babel/babel/releases)
- [Changelog](https://github.com/babel/babel/blob/master/CHANGELOG.md)
- [Commits](babel/babel@v7.4.5...v7.7.6)

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

Author: dependabot-preview[bot]

package.json

@@ -41,7 +41,7 @@
     "@babel/plugin-syntax-dynamic-import": "^7.2.0",
     "@babel/plugin-transform-runtime": "^7.4.4",
     "@babel/polyfill": "^7.4.4",
-    "@babel/preset-env": "7.4.5",
+    "@babel/preset-env": "7.7.6",
     "@babel/preset-flow": "7.7.4",
     "@babel/preset-react": "7.0.0",
     "@babel/register": "^7.4.4",

packages/examples/graphiql-webpack/package.json

@@ -18,7 +18,7 @@
   "devDependencies": {
     "@babel/plugin-proposal-class-properties": "7.7.4",
     "@babel/plugin-syntax-dynamic-import": "7.7.4",
-    "@babel/preset-env": "7.7.1",
+    "@babel/preset-env": "7.7.6",
     "@babel/preset-react": "7.7.0",
     "babel-loader": "^8.0.6",
     "css-loader": "3.2.0",