Bump epinio server version (#472)

* chore: key "$.appVersion" updated from "v1.9.0-rc5" to "v1.9.0", in f...

... ile "chart/epinio/Chart.yaml"

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* Update Chart.yaml

---------

Co-authored-by: GitHub Actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Enrico Candino <enrico.candino@suse.com>

chart/epinio/Chart.yaml

@@ -1,8 +1,8 @@
 annotations:
  artifacthub.io/license: Apache-2.0
- artifacthub.io/prerelease: "true"
+ artifacthub.io/prerelease: "false"
 apiVersion: v2
-appVersion: v1.9.0-rc5
+appVersion: v1.9.0
 dependencies:
 - condition: global.dex.enabled
  name: dex
@@ -41,4 +41,4 @@ maintainers:
 name: epinio
 sources:
 - https://github.com/epinio/epinio
-version: 1.9.0-rc5
+version: 1.9.0