Change productId to strings

plugins/VCV-Console.json

@@ -4,5 +4,5 @@
   "author": "VCV",
   "license": "proprietary",
   "version": "0.5.0",
-  "productId": 521624682539
+  "productId": "521624682539"
 }

plugins/VCV-PulseMatrix.json

@@ -5,5 +5,5 @@
   "license": "proprietary",
   "version": "0.5.1",
   "manual": "https://vcvrack.com/plugins/PulseMatrix.html",
-  "productId": 449821147179
+  "productId": "449821147179"
 }