chore(deps): pin dependency jest-junit to 6.4.0 (#1854)

Author: renovate[bot]

package.json

@@ -79,7 +79,7 @@
     "html-webpack-plugin": "3.2.0",
     "husky": "2.2.0",
     "jest": "24.8.0",
-    "jest-junit": "^6.3.0",
+    "jest-junit": "6.4.0",
     "jquery": "3.4.1",
     "less": "3.9.0",
     "less-loader": "5.0.0",