fix(deps): update dependency org.openapitools:openapi-generator to v7.9.0

Author: renovate[bot]

generator/pom.xml

@@ -126,7 +126,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <openapi-generator-version>7.8.0</openapi-generator-version>
+        <openapi-generator-version>7.9.0</openapi-generator-version>
         <maven-plugin-version>1.0.0</maven-plugin-version>
         <junit-version>4.13.2</junit-version>
     </properties>