Infra: Upgrade openapi generator to 7.15.0

Author: yeikel

gradle/libs.versions.toml

@@ -30,7 +30,7 @@ okhttp3 = '4.12.0'
 testcontainers = '1.20.6'
 swagger-integration-jakarta = '2.2.28'
 jakarta-annotation-api = '2.1.1'
-jackson-databind-nullable = '0.2.6'
+jackson-databind-nullable = '0.2.7'
 antlr = '4.13.2'
 json-schema-validator = '2.2.14'
 checkstyle = '10.24.0'
@@ -43,7 +43,7 @@ spring-boot = { id = 'org.springframework.boot', version.ref = 'spring-boot' }
 spring-dependency-management = { id = 'io.spring.dependency-management', version = '1.1.3' }
 git-properties = { id = 'com.gorylenko.gradle-git-properties', version = '2.4.2' }
 openapi-validator = {id = "org.openapitools.openapistylevalidator", version = "1.10" }
-openapi-generator = { id = 'org.openapi.generator', version = '7.13.0' }
+openapi-generator = { id = 'org.openapi.generator', version = '7.15.0' }
 nexus-publish-plugin = { id = 'io.github.gradle-nexus.publish-plugin', version = '1.1.0' }
 node-gradle = { id = 'com.github.node-gradle.node', version = '7.1.0' }
 docker-remote-api = { id = 'com.bmuschko.docker-remote-api', version = '9.4.0' }