bump build plugin deps

plugins/netlify-plugin-amp-optimizer/package.json

@@ -12,35 +12,19 @@
     "index.js"
   ],
   "main": "index.js",
-  "scripts": {
-    "build": "netlify build",
-    "test": "xo"
-  },
   "dependencies": {
     "@ampproject/toolbox-optimizer": "^2.7.6",
     "@ampproject/toolbox-update-cache": "^2.7.6",
-    "cssnano-simple": "^1.2.2",
-    "glob": "^7.1.6",
+    "cssnano-simple": "^2.0.0",
+    "glob": "^7.1.7",
     "jimp": "^0.16.1",
     "lru-cache": "^6.0.0",
-    "postcss": "^8.2.4",
+    "postcss": "^8.x",
     "postcss-safe-parser": "^5.0.2",
     "probe-image-size": "^7.1.0",
-    "terser": "^5.5.1"
-  },
-  "devDependencies": {
-    "netlify-cli": "*",
-    "xo": "~0.39.1"
+    "terser": "^5.7.0"
   },
   "engines": {
     "node": ">=10.18"
-  },
-  "xo": {
-    "semicolon": false,
-    "space": 2,
-    "rules": {
-      "object-curly-spacing": 0
-    }
-  },
-  "_id": "netlify-plugin-amp-optimizer@1.0.0"
+  }
 }