fix: upgrade cli@~5.x, fix: /deep/ warning

Author: sendya

package.json

@@ -44,20 +44,20 @@
     "@commitlint/cli": "^12.1.4",
     "@commitlint/config-conventional": "^12.1.4",
     "@vue/babel-helper-vue-jsx-merge-props": "^1.2.1",
-    "@vue/cli-plugin-babel": "^4.5.17",
-    "@vue/cli-plugin-eslint": "^4.5.17",
-    "@vue/cli-plugin-router": "^4.5.17",
-    "@vue/cli-plugin-unit-jest": "^4.5.17",
-    "@vue/cli-plugin-vuex": "^4.5.17",
-    "@vue/cli-service": "^4.5.17",
+    "@vue/cli-plugin-babel": "~5.0.8",
+    "@vue/cli-plugin-eslint": "~5.0.8",
+    "@vue/cli-plugin-router": "~5.0.8",
+    "@vue/cli-plugin-unit-jest": "~5.0.8",
+    "@vue/cli-plugin-vuex": "~5.0.8",
+    "@vue/cli-service": "~5.0.8",
     "@vue/eslint-config-standard": "^4.0.0",
     "@vue/test-utils": "^1.3.0",
     "babel-eslint": "^10.1.0",
     "babel-plugin-import": "^1.13.3",
     "babel-plugin-transform-remove-console": "^6.9.4",
     "commitizen": "^4.2.4",
     "cz-conventional-changelog": "^3.3.0",
-    "eslint": "^5.16.0",
+    "eslint": "^7.0.0",
     "eslint-plugin-html": "^5.0.5",
     "eslint-plugin-vue": "^5.2.3",
     "file-loader": "^6.2.0",
@@ -66,6 +66,7 @@
     "less": "^3.13.1",
     "less-loader": "^5.0.0",
     "lint-staged": "^12.5.0",
+    "postcss": "^8.3.5",
     "postcss-less": "^6.0.0",
     "regenerator-runtime": "^0.13.9",
     "stylelint": "^14.8.5",