feat: update Flipt version to release v1.39.0 (#133)

Co-authored-by: flipt-bot <[email protected]>

charts/flipt/Chart.yaml

@@ -3,8 +3,8 @@ name: flipt
 home: https://flipt.io
 description: Flipt is an open-source, self-hosted feature flag solution.
 type: application
-version: 0.54.2
-appVersion: v1.38.2
+version: 0.55.0
+appVersion: v1.39.0
 maintainers:
   - name: Flipt
     url: https://github.com/flipt-io/helm-charts