chore/update to 2.0.0-rc.3 app version

[jimid27]

What this PR does / why we need it:

This PR (could be a temporary item) updates the flux manifests/CRDs to use the latest version of flux (2.0.0-rc.3) for those who want to adopt the use of the Helm charts to bootstrap the cluster on the new version.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #172

Special notes for your reviewer:

• Tried make generate and it sort of worked but kept added "U" as part of the CRDs. Not exactly sure why that happened at this point.

  Checklist

• [X] DCO signed
• [X] Chart Version bumped
• [X] helm-docs are updated
• [X] Helm chart is tested
• [X] Update artifacthub.io/changes in Chart.yaml
• [X] Run make reviewable

[jimid27]

LGTM

Thanks @jimid27 for saving the day, I was about to archive this repo.

No problem! Looking forward to using these charts!