chore!: update versions of underlying webpack loaders (#4331)

BREAKING CHANGE:
- The minimum required nodejs version is 8.9.0
- For css-loader breaking changes, see https://github.com/webpack-contrib/css-loader/releases/tag/v3.0.0
- For url-loader breaking changes, see https://github.com/webpack-contrib/url-loader/releases/tag/v2.0.0

Author: haoqunjiang

packages/@vue/cli-service/package.json

@@ -35,21 +35,21 @@
     "address": "^1.1.0",
     "autoprefixer": "^9.5.1",
     "browserslist": "^4.6.0",
-    "cache-loader": "^3.0.1",
+    "cache-loader": "^4.1.0",
     "case-sensitive-paths-webpack-plugin": "^2.2.0",
     "chalk": "^2.4.2",
     "cli-highlight": "^2.1.1",
     "clipboardy": "^2.0.0",
     "cliui": "^5.0.0",
     "copy-webpack-plugin": "^5.0.3",
-    "css-loader": "^2.1.1",
+    "css-loader": "^3.1.0",
     "cssnano": "^4.1.10",
     "current-script-polyfill": "^1.0.0",
     "debug": "^4.1.1",
     "default-gateway": "^5.0.2",
     "dotenv": "^8.0.0",
     "dotenv-expand": "^5.1.0",
-    "file-loader": "^3.0.1",
+    "file-loader": "^4.1.0",
     "fs-extra": "^7.0.1",
     "globby": "^9.2.0",
     "hash-sum": "^1.0.2",
@@ -58,7 +58,7 @@
     "lodash.defaultsdeep": "^4.6.1",
     "lodash.mapvalues": "^4.6.0",
     "lodash.transform": "^4.6.0",
-    "mini-css-extract-plugin": "^0.6.0",
+    "mini-css-extract-plugin": "^0.8.0",
     "minimist": "^1.2.0",
     "ora": "^3.4.0",
     "portfinder": "^1.0.20",
@@ -71,7 +71,7 @@
     "string.prototype.padend": "^3.0.0",
     "terser-webpack-plugin": "^1.3.0",
     "thread-loader": "^2.1.2",
-    "url-loader": "^1.1.2",
+    "url-loader": "^2.1.0",
     "vue-loader": "^15.7.0",
     "webpack": ">=4 < 4.29",
     "webpack-bundle-analyzer": "^3.3.2",