bump k8s.io/system-validators to v1.7.0

- add blkio as an optionally required cgroup
- update blang/semver to v4
- bump the min go version to 1.16

vendor/k8s.io/system-validators/validators/cgroup_validator_linux.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 /*

vendor/k8s.io/system-validators/validators/cgroup_validator_other.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 /*

vendor/k8s.io/system-validators/validators/package_validator_linux.go

@@ -1,3 +1,4 @@
+//go:build linux
 // +build linux
 
 /*
@@ -24,7 +25,7 @@ import (
 	"os/exec"
 	"strings"
 
-	"github.com/blang/semver"
+	"github.com/blang/semver/v4"
 	"github.com/pkg/errors"
 )
 

vendor/k8s.io/system-validators/validators/package_validator_other.go

@@ -1,3 +1,4 @@
+//go:build !linux
 // +build !linux
 
 /*

vendor/k8s.io/system-validators/validators/types_unix.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 /*
@@ -67,9 +68,12 @@ var DefaultSysSpec = SysSpec{
 		// The hugetlb cgroup is optional since some kernels are compiled without support for huge pages
 		// and therefore lacks corresponding hugetlb cgroup
 		"hugetlb",
+		// The blkio cgroup is optional since some kernels are compiled without support for block I/O throttling.
+		// Containerd and cri-o will use blkio to track disk I/O and throttling in both cgroup v1 and v2.
+		"blkio",
 	},
 	CgroupsV2:         []string{"cpu", "cpuset", "devices", "freezer", "memory", "pids"},
-	CgroupsV2Optional: []string{"hugetlb"},
+	CgroupsV2Optional: []string{"hugetlb", "blkio"},
 	RuntimeSpec: RuntimeSpec{
 		DockerSpec: &DockerSpec{
 			Version:     []string{`1\.1[1-3]\..*`, `17\.0[3,6,9]\..*`, `18\.0[6,9]\..*`, `19\.03\..*`, `20\.10\..*`},

vendor/k8s.io/system-validators/validators/types_windows.go

@@ -1,3 +1,4 @@
+//go:build windows
 // +build windows
 
 /*