Bump golang.org/x/sys from 0.20.0 to 0.21.0 #1031

Job	Run time
Build nikos	41s
Check GLIBC references	10s
Molecule tests (fedora, host)	7m 25s
Molecule tests (fedora, container)	11m 24s
Molecule tests (centos, host)	5m 35s
Molecule tests (centos, container)	9m 15s
Molecule tests (opensuse, host)	7m 21s
Molecule tests (opensuse, container)	5m 4s
Molecule tests (debian, host)	7m 34s
Molecule tests (debian, container)	7m 9s
Molecule tests (ubuntu, host)	9m 6s
Molecule tests (ubuntu, container)	9m 1s
Molecule tests (oracle, host)	8m 20s
Molecule tests (oracle, container)	6m 54s
Molecule tests (amazon-linux, host)	3m 56s
Molecule tests (amazon-linux, container)	4m 31s
	1h 43m 26s

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