chore(deps): update metabase/metabase docker tag to v0.51.6 (#95)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Diff for: charts/nr-metabase/values.yaml

@@ -24,7 +24,7 @@ metabase:
   # the below is for renovate to keep pushing PRs, so that it keeps getting updated.
   metabaseImage:
     repository: metabase/metabase
-    tag: v0.51.5
+    tag: v0.51.6
   containerPort: 3000
   environment: production
   service: