build(deps-dev): bump webpack from 3.11.0 to 3.12.0

Bumps [webpack](https://github.com/webpack/webpack) from 3.11.0 to 3.12.0.
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v3.11.0...v3.12.0)

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

Author: dependabot-preview[bot]

yarn.lock

@@ -476,13 +476,7 @@ async@^1.5.2:
   version "1.5.2"
   resolved "https://registry.yarnpkg.com/async/-/async-1.5.2.tgz#ec6a61ae56480c0c3cb241c95618e20892f9672a"
 
-async@^2.0.0, async@^2.1.2:
-  version "2.6.0"
-  resolved "https://registry.yarnpkg.com/async/-/async-2.6.0.tgz#61a29abb6fcc026fea77e56d1c6ec53a795951f4"
-  dependencies:
-    lodash "^4.14.0"
-
-async@^2.5.0, async@^2.6.1:
+async@^2.0.0, async@^2.1.2, async@^2.5.0, async@^2.6.1:
   version "2.6.2"
   resolved "https://registry.yarnpkg.com/async/-/async-2.6.2.tgz#18330ea7e6e313887f5d2f2a904bac6fe4dd5381"
   integrity sha512-H1qVYh1MYhEEFLsP97cVKqCGo7KfCyTt6uEWqsTBr9SO84oK9Uwbyd/yCW+6rKJLHksBNUVWZDAjfS+Ccx0Bbg==
@@ -3292,7 +3286,7 @@ lodash.templatesettings@^4.0.0:
   dependencies:
     lodash._reinterpolate "~3.0.0"
 
-lodash@^4.0.0, lodash@^4.14.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.2.1:
+lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.2.1:
   version "4.17.11"
   resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.11.tgz#b39ea6229ef607ecd89e2c8df12536891cac9b8d"
 
@@ -5876,8 +5870,9 @@ webpack-sources@^1.0.1:
     source-map "~0.6.1"
 
 webpack@^3.11.0:
-  version "3.11.0"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-3.11.0.tgz#77da451b1d7b4b117adaf41a1a93b5742f24d894"
+  version "3.12.0"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-3.12.0.tgz#3f9e34360370602fcf639e97939db486f4ec0d74"
+  integrity sha512-Sw7MdIIOv/nkzPzee4o0EdvCuPmxT98+vVpIvwtcwcF1Q4SDSNp92vwcKc4REe7NItH9f1S4ra9FuQ7yuYZ8bQ==
   dependencies:
     acorn "^5.0.0"
     acorn-dynamic-import "^2.0.0"