Upgrade brace-expansion NPM package due to security issue

https://nodesecurity.io/advisories/338

changelogs/unreleased/fix-npm-security-updates.yml

+---
+title: Upgrade brace-expansion NPM package due to security issue
+merge_request: 13665
+author: Markus Koller
+type: security

package.json

@@ -20,6 +20,7 @@
     "babel-preset-latest": "^6.24.0",
     "babel-preset-stage-2": "^6.22.0",
     "bootstrap-sass": "^3.3.6",
+    "brace-expansion": "^1.1.8",
     "compression-webpack-plugin": "^1.0.0",
     "copy-webpack-plugin": "^4.0.1",
     "core-js": "^2.4.1",

yarn.lock

@@ -990,7 +990,7 @@ brace-expansion@^1.0.0:
     balanced-match "^0.4.1"
     concat-map "0.0.1"
 
-brace-expansion@^1.1.7:
+brace-expansion@^1.1.8:
   version "1.1.8"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
   dependencies: