Fix Chart version

Signed-off-by: Benoit Pourre <benoit.pourre@gmail.com>

Chart.yaml

@@ -40,4 +40,4 @@ sources:
   - https://github.com/captnbp/opensearch-helm
   - https://github.com/opensearch-project
   - https://opensearch.org/
-version: 3.0.7
\ No newline at end of file
+version: 3.0.8
\ No newline at end of file