Also use ubuntu-latest for the FreeBSD build #146

Job	Run time
buildroot (qemu_x86_defconfig, glibc)	1m 50s
buildroot (qemu_x86_defconfig, uclibc)	1m 36s
buildroot (qemu_x86_defconfig, musl)	1m 6s
buildroot (qemu_x86_64_defconfig, glibc)	1m 49s
buildroot (qemu_x86_64_defconfig, uclibc)	58s
buildroot (qemu_x86_64_defconfig, musl)	1m 34s
buildroot (raspberrypi4_defconfig, glibc)	1m 8s
buildroot (raspberrypi4_defconfig, uclibc)	1m 29s
buildroot (raspberrypi4_defconfig, musl)	1m 3s
buildroot (raspberrypi4_64_defconfig, glibc)	1m 49s
buildroot (raspberrypi4_64_defconfig, uclibc)	1m 2s
buildroot (raspberrypi4_64_defconfig, musl)	1m 35s
buildroot (qemu_ppc64le_pseries_defconfig, glibc)	1m 10s
buildroot (qemu_ppc64le_pseries_defconfig, uclibc)	1m 37s
buildroot (qemu_ppc64le_pseries_defconfig, musl)	1m 26s
buildroot (qemu_mips32r2_malta_defconfig, glibc)	1m 5s
buildroot (qemu_mips32r2_malta_defconfig, uclibc)	56s
buildroot (qemu_mips32r2_malta_defconfig, musl)	1m 4s
buildroot (qemu_mips64_malta_defconfig, glibc)	1m 9s
buildroot (qemu_mips64_malta_defconfig, uclibc)	57s
buildroot (qemu_mips64_malta_defconfig, musl)	1m 2s
buildroot (qemu_riscv32_virt_defconfig, glibc)	1m 5s
buildroot (qemu_riscv32_virt_defconfig, uclibc)	1m 34s
buildroot (qemu_riscv32_virt_defconfig, musl)	1m 5s
buildroot (qemu_riscv64_virt_defconfig, glibc)	1m 6s
buildroot (qemu_riscv64_virt_defconfig, uclibc)	57s
buildroot (qemu_riscv64_virt_defconfig, musl)	1m 26s
	34m 38s

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