Spurious failure of can_control_retry_delay_using_pam test

[bjorn3]

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It seems to wait just a bit too little.

https://github.com/trifectatechfoundation/sudo-rs/actions/runs/17973829856/job/51122560538?pr=1279

 ---- sudo::password_retry::can_control_retry_delay_using_pam stdout ----
[sudo-compliance-tests/src/sudo/password_retry.rs:136:5] delta_millis = 2157
[sudo-compliance-tests/src/sudo/password_retry.rs:136:5] delta_millis = 2960

thread 'sudo::password_retry::can_control_retry_delay_using_pam' panicked at sudo-compliance-tests/src/sudo/password_retry.rs:196:5:
assertion failed: newer_delta_millis >= 3_100
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


failures:
    sudo::password_retry::can_control_retry_delay_using_pam