BE: Deps: Update openapi dependency (#3906)

pom.xml

@@ -59,7 +59,7 @@
         <maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
         <maven-resources-plugin.version>3.2.0</maven-resources-plugin.version>
         <maven-surefire-plugin.version>2.22.2</maven-surefire-plugin.version>
-        <openapi-generator-maven-plugin.version>6.5.0</openapi-generator-maven-plugin.version>
+        <openapi-generator-maven-plugin.version>6.6.0</openapi-generator-maven-plugin.version>
         <springdoc-openapi-webflux-ui.version>1.2.32</springdoc-openapi-webflux-ui.version>
     </properties>