fix: changeTime is already in milliseconds (#3198)

We need to pass the timestamp in milliseconds to the date constructor,
this code was assuming that changeTime was in seconds and needed to be
multiplied by 1000 to get milliseconds but it is already in
milliseconds.

This led to the constructed date being incorrect.

packages/webpack-cli/src/plugins/CLIPlugin.ts

@@ -93,7 +93,7 @@ export class CLIPlugin {
     });
 
     compiler.hooks.invalid.tap(pluginName, (filename, changeTime) => {
-      const date = new Date(changeTime * 1000);
+      const date = new Date(changeTime);
 
       this.logger.log(`File '${filename}' was modified`);
       this.logger.log(`Changed time is ${date} (timestamp is ${changeTime})`);