Update dependency org.openapi.generator to v7.18.0 (#521)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 # https://docs.gradle.org/current/userguide/platforms.html#sub::toml-dependencies-format
 
 [versions]
-openapiGenerator = "7.17.0"
+openapiGenerator = "7.18.0"
 
 [plugins]
 openapi-generator = { id = "org.openapi.generator", version.ref = "openapiGenerator" }