Fix errors when running the test on Apple Silicon M1

[tenzen-y]

What this PR does / why we need it:
I fixed the following errors when running the test on Apple Silicon M1.

unable to find a version that was supported for platform darwin/arm64

It seems that this error occurred when setup-envtest tried to download the Kubernetes components binary for darwin/arm64 as described in this issue.
So I specified CPU architecture when running the setup-envtest.

# github.com/shirou/gopsutil/process
../../../../pkg/mod/github.com/shirou/[email protected]+incompatible/process/process_darwin.go:590:34: undefined: KinfoProc
../../../../pkg/mod/github.com/shirou/[email protected]+incompatible/process/process_darwin.go:591:8: undefined: KinfoProc
../../../../pkg/mod/github.com/shirou/[email protected]+incompatible/process/process_darwin.go:604:32: undefined: KinfoProc
../../../../pkg/mod/github.com/shirou/[email protected]+incompatible/process/process_darwin.go:608:62: undefined: KinfoProc

It seems that this error occurred since darwin/arm64 is not supported by the github.com/shirou/gopsutil v2 as described in this issue.
So I upgraded the github.com/shirou/gopsutil version to v3.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Checklist:

• Docs included if any changes are user facing

[tenzen-y]

We need to merge this PR after merging #1882.
/hold

[coveralls]

Coverage decreased (-0.3%) to 73.948% when pulling 95a5dda on tenzen-y:specify-cpu-arch into 72fff88 on kubeflow:master.

[gaocegege]

LGTM 👍
/lgtm

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gaocegege, tenzen-y

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[johnugeorge]

/lgtm

[tenzen-y]

I have fixed an error from shellcheck.
https://github.com/kubeflow/katib/runs/6750242050?check_suite_focus=true

[johnugeorge]

/lgtm

[tenzen-y]

@johnugeorge @gaocegege Thanks for your review!
/hold cancel