fix(deps): update dependency org.openapitools:openapi-generator to v7.20.0

Author: renovate[bot]

pom.xml

@@ -127,7 +127,7 @@
         <!--
             If you update openapi-generator-version ensure you change the Dockerfile as well
         -->
-        <openapi-generator-version>7.19.0</openapi-generator-version>
+        <openapi-generator-version>7.20.0</openapi-generator-version>
         <maven-plugin-version>1.0.0</maven-plugin-version>
         <junit-version>4.13.2</junit-version>
     </properties>