Cirrus CI: Update FreeBSD instances to 14.3 #6146

Job	Run time
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	8m 14s
build (macos-latest, gfortran, cmake)	33m 21s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	7m 42s
build (ubuntu-latest, gfortran, cmake)	46m 16s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	8m 33s
build (ubuntu-latest, flang, cmake)	46m 10s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	9m 51s
msys2 (UCRT64, int32, Release)	1h 48m 6s
neoverse_build	7m 40s
build (ubuntu-latest, gfortran, make)	24m 0s
build (macos-latest, gfortran, make)	11m 29s
build (ubuntu-latest, flang, make)	19m 23s
msys2 (MINGW32, int32, Release)	1h 13m 44s
msys2 (CLANG64, int32, Release)	1h 18m 56s
msys2 (UCRT64, int64, Release)	1h 46m 3s
msys2 (CLANG64, int64, Release)	1h 17m 6s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	1h 34m 44s
	12h 41m 18s

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