chore(deps): update docker.io/library/alpine docker tag to v3.20.1 (v1.0) #7420

Job	Run time
Build tetragon	12m 34s
Test kernel 4.19-20231026.065108 / test group 0	20m 38s
Test kernel 5.10-20231026.065108 / test group 0	27m 28s
Test kernel 5.15-20231026.065108 / test group 0	25m 45s
Test kernel 5.4-20231026.065108 / test group 0	25m 37s
Test kernel 6.1-20231026.065108 / test group 0	17m 56s
Test kernel bpf-next-20231030.012704 / test group 0	16m 24s
post-test	1s
	2h 26m 23s

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