Replace golang.org/x/exp/slices with slices #4806

Job	Run time
Windows tests	4m 17s
Integration tests	40m 55s
Colima (v0.6.5)	6m 14s
Integration tests (on Linux) (alpine.yaml)	4m 46s
Lints	1m 38s
Unit tests (1.21.x)	5m 20s
Integration tests (on Linux) (debian.yaml)	7m 28s
Upgrade test (v0.15.1)	21m 48s
Unit tests (1.22.x)	4m 26s
Integration tests (on Linux) (fedora.yaml)	7m 28s
VMNet test	36m 1s
Integration tests (on Linux) (archlinux.yaml)	7m 31s
vz (experimental/vz.yaml)	11m 6s
Integration tests (on Linux) (opensuse.yaml)	7m 52s
vz (fedora.yaml)	16m 26s
Integration tests (on Linux) (experimental/net-user-v2.yaml)	6m 59s
Integration tests (on Linux) (experimental/9p.yaml)	6m 11s
Integration tests (on Linux) (docker.yaml)	6m 43s
Integration tests (on Linux) (../hack/test-templates/alpine-9p-writable.yaml)	4m 19s
Integration tests (on Linux) (../hack/test-templates/test-misc.yaml)	18m 55s
	3h 46m 23s

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