Bump @material-ui/lab from 4.0.0-alpha.46 to 4.0.0-alpha.47

Bumps [@material-ui/lab](https://github.com/mui-org/material-ui/tree/HEAD/packages/material-ui-lab) from 4.0.0-alpha.46 to 4.0.0-alpha.47.
- [Release notes](https://github.com/mui-org/material-ui/releases)
- [Changelog](https://github.com/mui-org/material-ui/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mui-org/material-ui/commits/HEAD/packages/material-ui-lab)

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

Author: dependabot-preview[bot]

package-lock.json

@@ -10,7 +10,7 @@
   "dependencies": {
     "@material-ui/core": "^4.9.7",
     "@material-ui/icons": "^4.9.1",
-    "@material-ui/lab": "^4.0.0-alpha.46",
+    "@material-ui/lab": "^4.0.0-alpha.47",
     "next": "9.3.1",
     "react": "16.13.1",
     "react-dom": "16.13.0"

package.json

@@ -947,10 +947,10 @@
   dependencies:
     "@babel/runtime" "^7.4.4"
 
-"@material-ui/lab@^4.0.0-alpha.46":
-  version "4.0.0-alpha.46"
-  resolved "https://registry.yarnpkg.com/@material-ui/lab/-/lab-4.0.0-alpha.46.tgz#453546d58d3a0064263c198dedb6a1c54d24d1a4"
-  integrity sha512-JGgZmj1UNP8bbYNAGvndipjXRK3x2+9mFBzbX7MyCj+WpfnJbeqTmJK2No9MXvPj/EZJ1piaKif46FdDc4U93A==
+"@material-ui/lab@^4.0.0-alpha.47":
+  version "4.0.0-alpha.47"
+  resolved "https://registry.yarnpkg.com/@material-ui/lab/-/lab-4.0.0-alpha.47.tgz#757a336e4c2496f700a392ff41e25a7d460a387b"
+  integrity sha512-+WC3O0M/769D3nO9Rqupusc+lob7tQMe5/DnOjAhZ0bpXlJbhZb7N84WkEk4JgQLj6ydP8e9Jhqd1lG+mGj+xw==
   dependencies:
     "@babel/runtime" "^7.4.4"
     "@material-ui/utils" "^4.9.6"