Add Release arm64

[nktks]

Hello.

I added release binary of arm64 arch to goos darwin and linux.

I tested workflow at https://github.com/nktks/kleat/actions/runs/2759808342 and released at https://github.com/nktks/kleat/releases/tag/v0.6.1 and tested to execute kleat -v at only darwin_arm64 binary.

And I fixed mergify setting https://github.com/spinnaker/kleat/pull/203#issuecomment-1200058810 Thanks!

[nktks]

https://github.com/spinnaker/kleat/pull/203/checks?check_run_id=7576708578 says extra keys not allowed @ pull_request_rules → item 0 → actions → merge → strict probably this feature is deleted from mergify https://docs.mergify.com/actions/merge/

So I'll delete this.