Bump babel-plugin-transform-property-literals from 6.8.5 to 6.9.4

Bumps [babel-plugin-transform-property-literals](https://github.com/babel/minify) from 6.8.5 to 6.9.4.
- [Release notes](https://github.com/babel/minify/releases)
- [Changelog](https://github.com/babel/minify/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/minify/compare/babel-plugin-transform-property-literals@6.8.5...babel-plugin-transform-property-literals@6.9.4)

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

Author: dependabot-support

package-lock.json

@@ -810,15 +810,9 @@ babel-plugin-transform-minify-booleans@^6.8.3:
   version "6.8.3"
   resolved "https://registry.yarnpkg.com/babel-plugin-transform-minify-booleans/-/babel-plugin-transform-minify-booleans-6.8.3.tgz#5906ed776d3718250519abf1bace44b0b613ddf9"
 
-babel-plugin-transform-property-literals@^6.8.4:
-  version "6.8.4"
-  resolved "https://registry.yarnpkg.com/babel-plugin-transform-property-literals/-/babel-plugin-transform-property-literals-6.8.4.tgz#6ad311110b80a192a56efb5ddf4fe3ca6f7a61da"
-  dependencies:
-    esutils "^2.0.2"
-
-babel-plugin-transform-property-literals@^6.8.5:
-  version "6.8.5"
-  resolved "https://registry.yarnpkg.com/babel-plugin-transform-property-literals/-/babel-plugin-transform-property-literals-6.8.5.tgz#67ed5930b34805443452c8b9690c7ebe1e206c40"
+babel-plugin-transform-property-literals@^6.8.4, babel-plugin-transform-property-literals@^6.8.5:
+  version "6.9.4"
+  resolved "https://registry.yarnpkg.com/babel-plugin-transform-property-literals/-/babel-plugin-transform-property-literals-6.9.4.tgz#98c1d21e255736573f93ece54459f6ce24985d39"
   dependencies:
     esutils "^2.0.2"