build: drop Node 10 support

BREAKING CHANGE: dropped Node 10 support.

Author: TheDancingCode

package.json

@@ -25,7 +25,7 @@
   },
   "homepage": "https://github.com/TheDancingCode/gulp-cloudinary-upload#readme",
   "engines": {
-    "node": ">=10"
+    "node": ">=12"
   },
   "files": [
     "index.js"