update bpftrace to v0.21.2 #27

Job	Run time
Build bpftools archive (arm64)	1h 30m 1s
Build static bpftrace binaries (arm64)	1h 25m 39s
Build bpftools archive (x86_64)	1h 28m 48s
Build bpftools-min archive (arm64)	1h 28m 49s
Build static bpftrace binaries (x86_64)	1h 27m 18s
Build bpftools-min archive (x86_64)	1h 30m 1s
Build static bpftrace binaries (armv7)	1h 24m 55s
	10h 15m 31s

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