feat: update Flipt v2 chart to release v2.4.0 (#253)

Co-authored-by: flipt-bot <dev@flipt.io>

Author: flipt-release-bot[bot]

charts/flipt-v2/Chart.yaml

@@ -5,8 +5,8 @@ description: >-
   Flipt v2 is a Git-native, open-source feature flag solution with enhanced
   authentication and multi-environment support.
 type: application
-version: 2.3.1
-appVersion: v2.3.1
+version: 2.4.0
+appVersion: v2.4.0
 maintainers:
   - name: Flipt
     url: https://github.com/flipt-io/helm-charts