fix: fix miss makezero bug

[alingse]

I was running github actions to run linter makezero for top github golang repos.

see issues alingse/go-linter-runner#1

and the github actions output https://github.com/alingse/go-linter-runner/actions/runs/9242680355/job/25425806374

====================================================================================================
append to slice `mountInfos` with non-zero initialized length at https://github.com/cdk-team/CDK/blob/main/pkg/util/cgroup.go#L130:16
append to slice `ret` with non-zero initialized length at https://github.com/cdk-team/CDK/blob/main/pkg/util/cgroup.go#L1[9](https://github.com/alingse/go-linter-runner/actions/runs/9242680355/job/25425806374#step:4:10)0:9
append to slice `sLst` with non-zero initialized length at https://github.com/cdk-team/CDK/blob/main/pkg/evaluate/cgroups.go#L40:[10](https://github.com/alingse/go-linter-runner/actions/runs/9242680355/job/25425806374#step:4:11)
====================================================================================================

the mountInfos and sLst is easy to check they are bugs , but ret is hard to fix, so I do not commit it.

// get kernel version
func GetKernelVersion() ([]int, error) {
	utsInfo := &unix.Utsname{}
	err := unix.Uname(utsInfo)
	if err != nil {
		return nil, err
	}
	relStr := string(utsInfo.Release[:])
	relIdx := strings.Index(relStr, "-")
	if relIdx == -1 {
		return nil, errors.New("unknown internal error when executing uname")
	}
	ret := make([]int, 3)
	for _, v := range strings.Split(relStr[:relIdx], ".") {
		verData, err := strconv.Atoi(v)
		if err != nil {
			return nil, err
		}
		ret = append(ret, verData)
	}
	return ret, nil
}

if we update ret := make([]int, 3) to ret := make([]int, 0, 3)

the GetKernelVersion may got ret with length less 3, if the user use index to operate it, may got some error, 🤔

so you can choose fix it or not.