build(deps-dev): Bump webpack-sources from 1.0.1 to 1.4.3 (#61)

Bumps [webpack-sources](https://github.com/webpack/webpack-sources) from 1.0.1 to 1.4.3.
- [Release notes](https://github.com/webpack/webpack-sources/releases)
- [Commits](webpack/webpack-sources@v1.0.1...v1.4.3)

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

package.json

@@ -142,7 +142,7 @@
     "webpack-dev-server": "^3.1.14",
     "webpack-merge": "^4.2.1",
     "webpack-node-externals": "^1.7.2",
-    "webpack-sources": "1.0.1"
+    "webpack-sources": "1.4.3"
   },
   "dependencies": {
     "async": "^3.1.1",