[BUG] Overflow in maximum value validator (python and others)

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?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

With a schema like this:

"item": {
  "maximum": 18446744073709551615,
  "type": "integer",
  "minimum": 0
}

The python generator produces a validator like this:

      validations = {
          ('value',): {
              'inclusive_maximum': -1,
              'inclusive_minimum': 0,
          },
      }

It seems like that maximum value is overflowing. (These ranges are automatically generated by my openapi library for uint64_t types.) This also affects a number of other generators I've tried.

openapi-generator version

>docker run --rm openapitools/openapi-generator-cli version
6.0.1-SNAPSHOT

OpenAPI declaration file content or url

{"openapi":"3.0.0","info":{"version":"2.0","title":"Test API"},"servers":[{"url":"http://localhost:8092/api"}],"paths":{"/":{"get":{"operationId":"top","responses":{"200":{"$ref":"#/components/responses/top"}}}}},"components":{"schemas":{"item":{"maximum":18446744073709551615,"type":"integer","minimum":0}},"responses":{"top":{"description":"top result","content":{"application/json":{"schema":{"items":{"$ref":"#/components/schemas/item"}}}}}}}}

Generation Details

docker run -v $PWD:/data --rm openapitools/openapi-generator-cli generate -i /data/openapi.json -g python -o /data/python

Reproduce the issue using the provided OpenAPI declaration and the Python generator command in Docker, then inspect how the maximum constraint becomes the generated validator's inclusive_maximum value. Trace the shared generator or template path responsible and check whether the same overflow affects the other generators mentioned. Done means the uint64 maximum remains correct in generated validation and regression coverage confirms it.