ykclient: re-deprecate on 2023-07-29

[cho-m]

Relates to #106902.

Issue was opened for pam_yubico on 2022-07-29: Yubico/yubico-pam#242

Currently no response upstream. 1 year seems like reasonable grace period so we can automatically deprecate both ykclient and pam_yubico after timeframe.

We can re-enable pam_yubico if upstream shows activity.

---

pam_yubico:

install: 57 (30 days), 132 (90 days), 401 (365 days)
install-on-request: 57 (30 days), 132 (90 days), 401 (365 days)
build-error: 0 (30 days)

ykclient:

install: 59 (30 days), 127 (90 days), 388 (365 days)
install-on-request: 5 (30 days), 10 (90 days), 40 (365 days)
build-error: 0 (30 days)

[carlocab]

@p-linnane, please use rebase-and-merge and not squash-and-merge when merging PRs with multiple commits. (Or just wait for @BrewTestBot to merge it.)