Update Helm release mariadb to v10.4.5

This MR contains the following updates:

Package	Update	Change
mariadb	patch	10.4.2 -> 10.4.5

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Chart.yaml

@@ -5,11 +5,11 @@ description: WordPress with a replicated MariaDB backend
 name: wordpress
 # Please only change the chart version as part of the release procedure: see
 # RELEASING.md
-version: 0.6.15
+version: 0.6.16
 icon: https://make.wordpress.org/design/files/2016/09/WordPress-logotype-wmark.png
 dependencies:
   - name: mariadb
-    version: 10.4.2
+    version: 10.4.5
     repository: "https://charts.bitnami.com/bitnami"
     tags:
       - mysql