[7.x] Update webpack-dev-server and webpack-cli (#82844) (#82881)

# Conflicts:
#	yarn.lock

Author: legrego

package.json

@@ -840,8 +840,8 @@
     "vinyl-fs": "^3.0.3",
     "wait-on": "^5.0.1",
     "watchpack": "^1.6.0",
-    "webpack-cli": "^3.3.10",
-    "webpack-dev-server": "^3.8.2",
+    "webpack-cli": "^3.3.12",
+    "webpack-dev-server": "^3.11.0",
     "webpack-merge": "^4.2.2",
     "write-pkg": "^4.0.0",
     "xml-crypto": "^2.0.0",