[bitnami/grafana] Update initContainers type to list (#8718)

Signed-off-by: Greg Atkinson <greg.a.atkinson@gmail.com>

bitnami/grafana/Chart.yaml

@@ -24,4 +24,4 @@ name: grafana
 sources:
   - https://github.com/bitnami/bitnami-docker-grafana
   - https://grafana.com/
-version: 7.6.2
+version: 7.6.3

bitnami/grafana/values.yaml

@@ -416,7 +416,7 @@ grafana:
   ##    imagePullPolicy: Always
   ##    command: ['sh', '-c', 'echo "hello world"']
   ##
-  initContainers: {}
+  initContainers: []
   ## @param grafana.extraVolumes Additional volumes for the Grafana pod
   ## Example:
   ## extraVolumes:
@@ -948,7 +948,7 @@ imageRenderer:
   ##    imagePullPolicy: Always
   ##    command: ['sh', '-c', 'echo "hello world"']
   ##
-  initContainers: {}
+  initContainers: []
   ## @param imageRenderer.extraEnvVarsCM Name of existing ConfigMap containing extra env vars for %%MAIN_CONTAINER_NAME%% nodes
   ##
   extraEnvVarsCM: ""