Map type date to correct rust type NaiveDate

[mlenger]

This PR fixes issue #9769: Type

type: string
format: date

is now correctly mapped to NaiveDate in accordance with the OpenAPI spec. Before it was mapped to DateTime which led to a server implementation that violated the spec (it expected a datetime value).

Furthermore some clippy errors were fixed that broke the integration tests when using rust 1.73.0.

@frol @farcaller @richardwhiuk @paladinzh @jacob-pro: please review

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[wing328]

Thanks for the PR but your commit (as shown in the Commits tab) is not linked to your Github account, which means this PR won't count as your contribution in https://github.com/OpenAPITools/openapi-generator/graphs/contributors.

Let me know if you need help fixing it.

Ref: https://github.com/OpenAPITools/openapi-generator/wiki/FAQ#how-can-i-update-commits-that-are-not-linked-to-my-github-account

[mlenger]

Thanks for the heads up! I added the commit email as secondary email address to my account. The PR is linked now.

[wing328]

tested locally and the tests passed.

thanks for the PR.

[wing328]

fyi. spotted an issue (not related to this PR) and filed #17124 to fix it