component/haproxy: Version up

2021/09/07 : 2.0.25
    - BUG/MEDIUM: sock: really fix detection of early connection failures in for 2.3-
    - REGTESTS: abortonclose: after retries, 503 is expected, not close
    - BUG/MEDIUM: base64: check output boundaries within base64{dec,urldec}
    - MINOR: compiler: implement an ONLY_ONCE() macro
    - BUG/MINOR: lua: use strlcpy2() not strncpy() to copy sample keywords
    - BUG/MINOR: ebtree: remove dependency on incorrect macro for bits per long
    - BUG/MINOR threads: Use get_(local|gm)time instead of (local|gm)time
    - BUG/MINOR: tools: Fix loop condition in dump_text()
    - CLEANUP: Add missing include guard to signal.h
    - DOC: configuration: remove wrong tcp-request examples in tcp-response
    - BUG/MINOR: config: reject configs using HTTP with bufsize >= 256 MB
    - CLEANUP: htx: remove comments about "must be < 256 MB"
    - BUG/MAJOR: htx: fix missing header name length check in htx_add_header/trailer
    - Revert "BUG/MINOR: stream-int: Don't block reads in si_update_rx() if chn may receive"
    - MINOR: action: Use a generic function to check validity of an action rule list
    - REGTESTS: mark http_abortonclose as broken