Fix mongodb 5/stable charm

Change-Id: I5f48d7c1bbe2a50c509f4db22605475480a66308
Signed-off-by: Guillermo Calvino <guillermo.calvino@canonical.com>
diff --git a/installers/charm/bundles/osm-ha/bundle.yaml b/installers/charm/bundles/osm-ha/bundle.yaml
index 96a2ff3..a4e84d3 100644
--- a/installers/charm/bundles/osm-ha/bundle.yaml
+++ b/installers/charm/bundles/osm-ha/bundle.yaml
@@ -60,7 +60,7 @@
     scale: 3
     series: kubernetes
     storage:
-      db: 50M
+      mongodb: 50M
   nbi:
     charm: osm-nbi
     channel: latest/beta