Limit uv auth login pyx.dev retries to 60s

[woodruffw]

Summary

Without this, a user who does uv auth login ... will retry against the service's status endpoint forever. This probably isn't what they intended (they probably walked away from their machine), so we end their login initiation session after 60 retries. Since we do a retry every second, this gives them no less than a minute to complete a login (which should be more than enough).

Test Plan

We don't have browser-negotiated login tests at the moment in CI, but I've tested this locally:

% ./target/debug/uv auth login pyx.dev
Logging in with https://api.pyx.dev/auth/cli/login/REDACTED
error: Login session timed out

(That took well over a minute, so 60s is a lower bound assuming a very optimal network roundtrip on each poll.)

[woodruffw]

With explicit timeout:

 ./target/debug/uv auth login pyx.dev
Logging in with https://api.pyx.dev/auth/cli/login/REDACTED
error: Login session timed out after 60 seconds

[woodruffw]

I'll fix that clippy issue in another PR.

[konstin]

Clippy is a required check, we require it for merging. If you push another commit with it, the auto-merge will go through.

(I've update the PR title for the changelog)