update dependencies to webpack5 compatible

Author: chenxsan

package.json

@@ -107,7 +107,7 @@
     "front-matter": "^4.0.2",
     "gh-pages": "^3.1.0",
     "html-loader": "^1.3.0",
-    "html-webpack-plugin": "^4.4.1",
+    "html-webpack-plugin": "^5.0.0-alpha.10",
     "http-server": "^0.12.3",
     "husky": "^4.3.0",
     "hyperlink": "^4.5.3",
@@ -151,7 +151,7 @@
     "webpack-cli": "^3.2.3",
     "webpack-dev-server": "^3.2.1",
     "webpack-merge": "^5.1.4",
-    "workbox-webpack-plugin": "^5.1.4"
+    "workbox-webpack-plugin": "^6.0.0-alpha.3"
   },
   "dependencies": {
     "docsearch.js": "^2.5.2",