fix: fixed github workflow issue

Author: Vikram Kalta

.github/workflows/maven-publish.yml

@@ -1,7 +1,7 @@
 name: Publish package to the Maven Central Repository
 on:
-  pull_request:
-    # types: [ created ]
+  release:
+    types: [ created ]
 jobs:
   publish-maven:
     runs-on: ubuntu-latest

pom.xml

@@ -4,7 +4,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.contentstack.sdk</groupId>
     <artifactId>utils</artifactId>
-    <version>1.2.14</version>
+    <version>1.2.15</version>
     <packaging>jar</packaging>
     <name>Contentstack-utils</name>
     <description>Java Utils SDK for Contentstack Content Delivery API, Contentstack is a headless CMS</description>