[thanos] Bump appVersion to 0.22.0

[gracedo]

Q	A
Bug fix?	no
New feature?	no
API breaks?	no
Deprecations?	no
Related tickets	N/A
License	Apache 2.0

What's in this PR?

Bumps thanos app version to 0.22.0

Why?

It's been awhile since thanos appversion has been bumped, 0.22.0 seems like a safe bump from looking at the release notes - shouldn't be any breaking changes to account for in the chart for this bump

Additional context

Checklist

• [x] Code meets the Developer Guide
• [x] User guide and development docs updated (if needed)
• [ ] Related Helm chart(s) updated (if needed)

To Do

• [ ] If the PR is not complete but you want to discuss the approach, list what remains to be done here

[gracedo]

@tarokkk @ahma The thanos chart hasn't been updated in awhile, would you mind reviewing this simple update to bump the appversion of thanos?

[danninov]

Any update for this?

[nishantapatil3]

#1342 change will address Thanos charts update, this PR can be closed