[feature]: reqwest 0.13

[Ape]

Use case

Currently openapi-to-rust generates a client using reqwest 0.12, which is not the latest release.

Other dependency crates could also be updated:

• reqwest-middleware 0.5
• thiserror 2

Area

Generated HTTP or SSE client

Representative OpenAPI fragment

Desired generated API or behavior

N/A

Alternatives considered

No response

Compatibility

• I considered whether this changes existing generated Rust APIs or wire behavior.
• I searched existing issues and discussions for this request.