release new version v0.22.0 of gadget

[krew-release-bot]

hey krew-index team,

I am krew-release-bot, and I would like to open this PR to publish version v0.22.0 of gadget on behalf of @mauriciovasquezbernal.

Thanks,
@krew-release-bot

[ahmetb]

🤖 Beep beep! I’m a robot speaking on behalf of @ahmetb. 🤖

---

This pull request does not seem to be a straightforward version bump. I'll have a human review this. If we don't respond within a day, feel free to ping us.

Why wasn't this detected as a plugin version bump:

file plugins/gadget.yaml is not a straightforward version bump: change on line 45 does not seem like a version bump: [- bin: kubectl-gadget]
/kind plugin-update

[ahmetb]

/lgtm
/approve
Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, krew-release-bot

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[mauriciovasquezbernal]

Thanks for the quick manual approval!