build(deps-dev): bump webpack-manifest-plugin from 1.3.2 to 2.0.0

Bumps [webpack-manifest-plugin](https://github.com/danethurber/webpack-manifest-plugin) from 1.3.2 to 2.0.0.
- [Release notes](https://github.com/danethurber/webpack-manifest-plugin/releases)
- [Commits](shellscape/webpack-manifest-plugin@v1.3.2...v2.0.0)

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

packages/stylesheets/core/package.json

@@ -49,7 +49,7 @@
     "style-loader": "^0.23.1",
     "svg-spritemap-webpack-plugin": "^1.2.0",
     "webpack": "^3.5.5",
-    "webpack-manifest-plugin": "^1.3.1"
+    "webpack-manifest-plugin": "^2.0.0"
   },
   "gitHead": "033030174dbf18623ccd9c0174108c41a9e588a1",
   "dependencies": {

yarn.lock

@@ -17976,6 +17976,15 @@ webpack-manifest-plugin@^1.3.1:
     fs-extra "^0.30.0"
     lodash ">=3.5 <5"
 
+webpack-manifest-plugin@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/webpack-manifest-plugin/-/webpack-manifest-plugin-2.0.0.tgz#691a0209e12083c375f6f22732ebc0e660437529"
+  integrity sha512-wr6rE6iVgevIO2NgKa021hJpO2xWCF5/TUK4i8u9pyVp6QVewG+qGT+kFSX4cMmhcVWTmTgryED2Wx+F384Aow==
+  dependencies:
+    fs-extra "^0.30.0"
+    lodash ">=3.5 <5"
+    tapable "^1.0.0"
+
 webpack-merge@^4.1.0:
   version "4.2.1"
   resolved "https://registry.yarnpkg.com/webpack-merge/-/webpack-merge-4.2.1.tgz#5e923cf802ea2ace4fd5af1d3247368a633489b4"