ci: only run on FreeBSD 13 and 14 #174

Job	Run time
freebsd (14.0)	3m 7s
cross-windows (aarch64-pc-windows-msvc)	1m 28s
freebsd (13.2)	3m 16s
aarch64-apple-ios	24s
cross-linux (aarch64, aarch64-unknown-linux-gnu, aarch64-linux-gnu)	46s
cross-windows (i686-pc-windows-msvc)	1m 55s
cross-linux (arm, armv7-unknown-linux-gnueabihf, arm-linux-gnueabihf)	38s
cross-linux (i386, i686-unknown-linux-gnu, i686-linux-gnu)	36s
android (aarch64-linux-android)	15s
build (windows-2019)	1m 43s
android (armv7-linux-androideabi)	14s
build (ubuntu-latest)	15s
android (x86_64-linux-android)	14s
build (macos-latest)	22s
android (i686-linux-android)	13s
	15m 26s

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