fix(deps): update dependency com.squareup.okhttp3:okhttp to v5.1.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
com.squareup.okhttp3:okhttp (source)	5.0.0 -> 5.1.0

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Release Notes

square/okhttp (com.squareup.okhttp3:okhttp)

v5.1.0

2025-07-07

• New: Response.peekTrailers(). When we changed Response.trailers() to block instead of
  throwing in 5.0.0, we inadvertently removed the ability for callers to peek the trailers
  (by catching the IllegalStateException if they weren't available). This new API restores that
  capability.

• Fix: Don't crash on trailers() if the response doesn't have a body. We broke [Retrofit] users
  who read the trailers on the raw() OkHttp response, after its body was decoded.

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