freebsd CI: remove 13.3 #1557

Job	Run time
stylecheck	17s
build-arch (all)	14m 58s
build-pr-review	3m 42s
build-arch (horizon.so)	4m 40s
build-debug	14m 57s
build (ubuntu:focal, g++, gcc, all)	15m 50s
build-opensuse (all)	13m 39s
build (ubuntu:focal, g++, gcc, horizon.so)	5m 51s
build-opensuse (horizon.so)	5m 22s
build (ubuntu:jammy, g++, gcc, all)	12m 41s
build (ubuntu:jammy, g++, gcc, horizon.so)	4m 13s
build (ubuntu:mantic, g++, gcc, all)	13m 47s
build (ubuntu:mantic, g++, gcc, horizon.so)	4m 38s
build (ubuntu:noble, g++, gcc, all)	15m 13s
build (ubuntu:noble, g++, gcc, horizon.so)	5m 2s
build (debian:bullseye, g++, gcc, all)	12m 46s
build (debian:bullseye, g++, gcc, horizon.so)	4m 13s
build (debian:bookworm, clang, clang, all)	13m 29s
build (debian:bookworm, clang, clang, horizon.so)	4m 20s
build (debian:bookworm, g++, gcc, all)	14m 55s
build (debian:bookworm, g++, gcc, horizon.so)	4m 45s
	3h 9m 18s

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