Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
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Description

When the json body contain a double/decimal field without decimal place, the deserialization process will throw exception. e.g.
when the json is
{
"myDouble" : 0.0
}
the deserialization is ok

however if it is
{
"myDouble" : 0
}

the deserialization throw exception

openapi-generator version

v6.5.0