chore: update core dependencies (#4928)

* chore: update core dependencies

* chore: update webpack merge

* chore: update snapshots

Author: snitin315

lib/Server.js

@@ -1642,7 +1642,7 @@ class Server {
 
         if (this.options.hot) {
           const HMRPluginExists = compiler.options.plugins.find(
-            (p) => p.constructor === webpack.HotModuleReplacementPlugin
+            (p) => p && p.constructor === webpack.HotModuleReplacementPlugin
           );
 
           if (HMRPluginExists) {