Update haproxy ports
pfSense-pkg-haproxy depends on net/haproxy18 which is currently 1.8.23
pfSense-pkg-haproxy-devel depends on net/haproxy which is currently 2.0.12
The backend packages are currently vulnerable to CVE-2020-11100 which affects HTTP/2. Though the pfSense packages do not include a means to configure HTTP/2, there is still a potential for advanced/manual configurations to be affected.
The master branch of the FreeBSD ports tree already has corrected versions (1.8.25, 2.0.14), but they have not yet been copied back to the quarterly branch.