[kotlin][jvm-spring-restclient] honour nullableReturnType in body access#23613

takkiraz wants to merge 3 commits intoOpenAPITools:masterOpenAPITools/openapi-generator:masterfrom

takkiraz:fix/kotlin-spring-restclient-nullable-returntakkiraz/openapi-generator:fix/kotlin-spring-restclient-nullable-returnCopy head branch name to clipboard