cirrus-ci: add FreeBSD 13 and bump FreeBSD 12 to 12.3 (#790)
cirrus-ci: add FreeBSD 13 and bump FreeBSD 12 to 12.3 (#790)

* cirrus-ci: add FreeBSD 13 and bump FreeBSD 12 to 12.3

* cirrus: drop freeBSD 11
seladb/PcapPlusPlus,seladb/PcapPlusPlus,seladb/PcapPlusPlus,seladb/PcapPlusPlus