update handler to newer version

modules/openapi-generator/pom.xml

@@ -298,7 +298,7 @@
         <dependency>
             <groupId>com.github.jknack</groupId>
             <artifactId>handlebars-jackson2</artifactId>
-            <version>${handlebars-java.version}</version>
+            <version>${handlebars-jackson2.version}</version>
         </dependency>
         <dependency>
             <groupId>commons-io</groupId>

pom.xml

@@ -1238,7 +1238,8 @@
         <git-commit-id-plugin.version>4.9.10</git-commit-id-plugin.version>
         <groovy.version>3.0.9</groovy.version>
         <guava.version>32.1.3-jre</guava.version>
-        <handlebars-java.version>4.3.1</handlebars-java.version>
+        <handlebars-java.version>4.5.0</handlebars-java.version>
+        <handlebars-jackson2.version>4.3.1</handlebars-jackson2.version>
         <jackson-threetenbp.version>2.18.2</jackson-threetenbp.version>
         <jackson.version>2.18.2</jackson.version>
         <jacoco.version>0.8.12</jacoco.version>