Drop node v14 support (#3085)

node v14 will have reached end-of-life by the next release.

From April 18th we can use node v20 instead of v19 for testing.

package.json

@@ -95,6 +95,6 @@
 		"fetch": "js/fetch.js"
 	},
 	"engines": {
-		"node": ">=14"
+		"node": ">=16"
 	}
 }