Update dependency webpack-dev-middleware to v3.7.3

This MR contains the following updates:

Package	Type	Update	Change
webpack-dev-middleware	devDependencies	patch	3.7.0 -> 3.7.3

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package.json

@@ -115,7 +115,7 @@
     "vue-loader": "14.2.4",
     "vue-style-loader": "4.1.2",
     "webpack": "4.46.0",
-    "webpack-dev-middleware": "3.7.0",
+    "webpack-dev-middleware": "3.7.3",
     "webpack-hot-middleware": "2.24.3",
     "webpack-merge": "0.14.1"
   },