chore(release): create release v0.9.1

[jaellio]

• I have cherry-picked any changes labelled needs-cherry-pick-vX.Y.Z

• I have made all of the following version and patch updates:

  1. Updated the container image tag in charts/osm/values.yaml
  2. Updated the chart and app version in charts/osm/Chart.yaml
  3. Updated the image tags used in the demo manifests
  4. Regenerated the Helm chart README.md

• I have checked that the base branch for this PR is correct as defined by the release guide

Is this a release candidate? no

[codecov-commenter]

Codecov Report

Merging #3719 (9e38327) into release-v0.9 (1e6e494) will increase coverage by 0.06%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           release-v0.9    #3719      +/-   ##
================================================
+ Coverage         66.51%   66.58%   +0.06%     
================================================
  Files               169      169              
  Lines              7945     7945              
================================================
+ Hits               5285     5290       +5     
+ Misses             2627     2622       -5     
  Partials             33       33              

Flag	Coverage Δ
unittests	66.58% <ø> (+0.06%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
cmd/cli/mesh_upgrade.go	45.83% <ø> (ø)
pkg/endpoint/providers/kube/client.go	79.20% <0.00%> (+0.99%)	⬆️
pkg/ticker/ticker.go	70.66% <0.00%> (+2.66%)	⬆️
pkg/kubernetes/announcement_handlers.go	77.14% <0.00%> (+5.71%)	⬆️

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