lxc: update to 6.0.3 #21170

Job	Run time
Feeds Package Test Build / Test aarch64_generic	13m 18s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	13m 1s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	12m 27s
Feeds Package Test Build / Test i386_pentium-mmx	13m 2s
Feeds Package Test Build / Test mips_24kc	12m 25s
Feeds Package Test Build / Test mipsel_24kc	13m 23s
Feeds Package Test Build / Test powerpc_464fp	12m 22s
Feeds Package Test Build / Test powerpc_8548	12m 36s
Feeds Package Test Build / Test riscv64_riscv64	12m 53s
Feeds Package Test Build / Test x86_64	13m 24s
	2h 8m 51s

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