MFV: Import blocklist 2025-04-28 (8aa81bf)

Merge commit '70f30afd4e9af5a51ee324d97e4d8c5f2124ec15'

Breaking changes:

• Upstream commit 24932b6 ("blocklistd: log the conf file line number with bad protocol errors") breaks backward database compatibility. An error will be displayed: Key size mismatch 296 != 288 A new and compatible database, with the new name, will be created when the service starts (committed separately).

• Upstream commit ddf6d71 ("implement BLOCKLIST_BAD_USER as a "one-count" failure") introduced BLOCKLIST_BAD_USER with a one-count failure mechanism. BLOCKLIST_AUTH_FAIL was implemented with a two-count failure mechanism. Since we utilize BLOCKLIST_AUTH_FAIL, the number of failed attempts now doubles towards the maximum limit (nfails). This commit will be reverted separately.

Changes:

https://github.com/zoulasc/blocklist/compare/7093cd9...8aa81bf

Approved by: re (cperciva)
Approved by: emaste (mentor)
MFC after: 2 days
Differential Revision: https://reviews.freebsd.org/D52869

(cherry picked from commit 48e64ca13d4f36795ac718911b805e3e9a726f1b)
(cherry picked from commit 1a08326c6f503db5f0fb9201cdf55379bbe576e8)