Update Helm chart metrics-server to v6.6.6

| datasource | package        | from  | to    |
| ---------- | -------------- | ----- | ----- |
| helm       | metrics-server | 6.2.6 | 6.6.6 |


Signed-off-by: Nicholas St. Germain <dirtycajunrice@users.noreply.github.com>

Author: renovate[bot]

cluster-critical/metrics-server/Chart.yaml

@@ -3,5 +3,5 @@ apiVersion: v2
 version: 1.0.0
 dependencies:
   - name: metrics-server
-    version: 6.2.6
+    version: 6.6.6
     repository: https://charts.bitnami.com/bitnami