pbr: update to 1.1.8 #21147

Job	Run time
Feeds Package Test Build / Test aarch64_generic	11m 48s
Feeds Package Test Build / Test arm_cortex-a15_neon-vfpv4	12m 4s
Feeds Package Test Build / Test arm_cortex-a9_vfpv3-d16	11m 17s
Feeds Package Test Build / Test i386_pentium-mmx	11m 52s
Feeds Package Test Build / Test mips_24kc	11m 20s
Feeds Package Test Build / Test mipsel_24kc	11m 20s
Feeds Package Test Build / Test powerpc_464fp	11m 23s
Feeds Package Test Build / Test powerpc_8548	11m 29s
Feeds Package Test Build / Test riscv64_riscv64	12m 36s
Feeds Package Test Build / Test x86_64	13m 19s
	1h 58m 28s

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