fix(helm): update chart mariadb-galera to 8.2.9

[renovate]

This PR contains the following updates:

Package	Update	Change
mariadb-galera (source)	patch	8.2.7 -> 8.2.9

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[github-actions]

Path: cluster/apps/galera/helmrelease.yaml
Version: 8.2.7 -> 8.2.9

@@ -11,9 +11,9 @@
     app.kubernetes.io/managed-by: Helm
 type: Opaque
 data:
-  mariadb-root-password: "N0NRcUVhV3BMVA=="
-  mariadb-password: "NWwxWG03bFFoMQ=="
-  mariadb-galera-mariabackup-password: "VVNCbkN1REw5Sw=="
+  mariadb-root-password: "OUVuODhISzZJUQ=="
+  mariadb-password: "eVd5NXhHdWZsaA=="
+  mariadb-galera-mariabackup-password: "anNCOEZTUm5TMQ=="
 ---
 # Source: mariadb-galera/templates/configmap.yaml
 apiVersion: v1