Update dependency org.openapitools:openapi-generator-maven-plugin to v7.18.0

Author: renovate[bot]

pom.xml

@@ -90,7 +90,7 @@
         <maven.compiler-plugin.version>3.14.1</maven.compiler-plugin.version>
         <maven.release-plugin.version>3.1.1</maven.release-plugin.version>
         <maven.resources-plugin.version>3.3.1</maven.resources-plugin.version>
-        <openapi-generator.version>7.17.0</openapi-generator.version>
+        <openapi-generator.version>7.18.0</openapi-generator.version>
         <swagger.version>2.2.41</swagger.version>
         <!-- ... -->
         <hibernate-validator.version>6.2.5.Final</hibernate-validator.version>