Update devDependencies (#34552)

* @babel/cli             ^7.14.5  →  ^7.14.8
* @babel/core            ^7.14.6  →  ^7.14.8
* @babel/preset-env      ^7.14.7  →  ^7.14.8
* eslint-config-xo       ^0.36.0  →  ^0.37.0
* eslint-plugin-unicorn  ^31.0.0  →  ^34.0.1
* hugo-bin               ^0.73.0  →  ^0.74.0

site/.eslintrc.json

@@ -10,7 +10,12 @@
     "xo/browser"
   ],
   "rules": {
+    "arrow-body-style": "off",
     "capitalized-comments": "off",
+    "comma-dangle": [
+      "error",
+      "never"
+    ],
     "indent": [
       "error",
       2,
@@ -30,6 +35,10 @@
       "always"
     ],
     "object-shorthand": "off",
+    "operator-linebreak": [
+      "error",
+      "after"
+    ],
     "prefer-arrow-callback": "off",
     "prefer-destructuring": "off",
     "semi": [
@@ -38,11 +47,15 @@
     ],
     "strict": "error",
     "unicorn/no-array-for-each": "off",
+    "unicorn/no-array-method-this-argument": "off",
     "unicorn/no-for-loop": "off",
     "unicorn/no-null": "off",
+    "unicorn/numeric-separators-style": "off",
+    "unicorn/prefer-array-flat": "off",
     "unicorn/prefer-dom-node-append": "off",
     "unicorn/prefer-dom-node-dataset": "off",
     "unicorn/prefer-module": "off",
+    "unicorn/prefer-prototype-methods": "off",
     "unicorn/prefer-query-selector": "off",
     "unicorn/prevent-abbreviations": "off"
   }