middleware update in webpackDevServer.config

[akashsasidhar]

DEP_WEBPACK_DEV_SERVER_ON_AFTER_SETUP_MIDDLEWARE & DEP_WEBPACK_DEV_SERVER_ON_BEFORE_SETUP_MIDDLEWARE warning removal
onAfterSetupMiddleware & onBeforeSetupMiddleware option has been deprecated, so the new option middleware have to be used in our package.

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