Bump haproxy version to 3.2.12

[CFN-CI]

Automatic bump from version 3.2.11 to version 3.2.12, downloaded from https://www.haproxy.org/download/3.2/src/haproxy-3.2.12.tar.gz.

After merge, consider releasing a new version of haproxy-boshrelease.

Changelog for HAProxy 3.2.12.

Please also check list of known open bugs for HAProxy 3.2.12.

The developer's summary for this release can be found in the Announcement post for the HAProxy 3.2.12 release.

HAPROXY CHANGELOG between 3.2.12 and 3.2.11

2026/02/12 : 3.2.12
    - MINOR: rawsock: introduce CO_RFL_TRY_HARDER to detect closures on complete reads
    - MEDIUM: ssl: don't always process pending handshakes on closed connections
    - BUG/MAJOR: applet: Don't call I/O handler if the applet was shut
    - BUG/MEDIUM: applet: Fix test on shut flags for legacy applets
    - DOC: internals: cleanup few typos in master-worker documentation
    - BUG/MEDIUM: threads: Atomically set TH_FL_SLEEPING and clr FL_NOTIFIED
    - CLEANUP: haproxy: fix bad line wrapping in run_poll_loop()
    - BUG/MINOR: cpu-topo: count cores not cpus to distinguish core types
    - BUG/MEDIUM: lb-chash: always properly initialize lb_nodes with dynamic servers
    - DOC: config: mention the limitation on server id range for consistent hash
    - BUG/MINOR: config: Fix setting of alt_proto
    - BUG/MINOR: startup: fix allocation error message of progname string
    - BUG/MINOR: startup: handle a possible strdup() failure
    - BUG/MAJOR: quic: reject invalid token
    - BUG/MAJOR: quic: fix parsing frame type