package/libhtp: security bump to v0.5.51

For more information on the release, see:
 - https://github.com/OISF/libhtp/releases/tag/0.5.51
 - https://github.com/OISF/libhtp/releases/tag/0.5.50
 - https://github.com/OISF/libhtp/compare/0.5.49...0.5.51

This fixes the following vulnerability:

- CVE-2025-53537

    LibHTP is a security-aware parser for the HTTP protocol and its
    related bits and pieces. In versions 0.5.50 and below, there is a
    traffic-induced memory leak that can starve the process of memory,
    leading to loss of visibility. To workaround this issue, set
    `suricata.yaml app-layer.protocols.http.libhtp.default-config.lzma-
    enabled` to false. This issue is fixed in version 0.5.51.

For more information, see:
  - https://www.cve.org/CVERecord?id=CVE-2025-53537
  - https://github.com/OISF/libhtp/security/advisories/GHSA-v3qq-h8mh-vph7

Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 0e450a0b08)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

package/libhtp/libhtp.hash

@@ -1,3 +1,3 @@
 # Locally computed:
-sha256  214395f8b42011154e133dfb4e94d15e4e3e3e12535e744a4c1eec8687d12c18  libhtp-0.5.49.tar.gz
+sha256  699475c2e512d5af05312e808f1f759a5d3c4cb154e73d82eaa6906ceacfaeb4  libhtp-0.5.51.tar.gz
 sha256  87c93904e5434c81622ea690c2b90097b9f162aaa92a96542649a157dbf98d15  LICENSE

package/libhtp/libhtp.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-LIBHTP_VERSION = 0.5.49
+LIBHTP_VERSION = 0.5.51
 LIBHTP_SITE = $(call github,OISF,libhtp,$(LIBHTP_VERSION))
 LIBHTP_LICENSE = BSD-3-Clause
 LIBHTP_LICENSE_FILES = LICENSE