chore: bump version to v1.4.0 for release

Bumps package.json version to v1.4.0 following the merge of the skip duplicate check feature PR (#18) to main.
Also verified build compiled successfully.

Author: traien

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@traien/n8n-nodes-espocrm",
-  "version": "1.3.0",
+  "version": "1.4.0",
   "description": "n8n integration with EspoCRM",
   "keywords": [
     "n8n-community-node-package",