Update openapi-generator-version to v7.12.0

Author: renovate[bot]

generator/pom.xml

@@ -152,7 +152,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <openapi-generator-version>7.11.0</openapi-generator-version>
+        <openapi-generator-version>7.12.0</openapi-generator-version>
         <maven-plugin-version>1.0.0</maven-plugin-version>
     </properties>
 </project>