Update Rust crate resend-rs to 0.17.1

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
resend-rs (source)	workspace.dependencies	minor	0.15.0 -> 0.17.1

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Release Notes

resend/resend-rust (resend-rs)

v0.17.1

Fixed

• The resend backend renamed the header used by the batch::send_with_batch_validation method

v0.17.0

Added

• Vec<CreateEmailOptions> now implements Idempotent (should've added this earlier, oops)
• Support for batch validation modes via BatchSvc::send_with_batch_validation
  (and SendEmailBatchResponse).
• New endpoint: emails::list

v0.16.1

Added

• Attachment::with_content_id, will replace Attachment::with_inline_content_id in the next
  major release.

v0.16.0

Added

• Attachment::with_inline_content_id
• Client::with_config allowing to create a Resend client with custom configuration
  (#​28)

Changed

• Attachment fields were made private to avoid future breaking changes when new fields are added.
  Use the Attachment for setting the fields instead.
• Tag fields were also made private.

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