chore(deps): update mariadb docker tag to v20

[renovate]

This PR contains the following updates:

Package	Update	Change
mariadb (source)	major	^19.1.2 -> ^20.0.0

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Release Notes

bitnami/charts (mariadb)

v20.0.0

• [bitnami/mariadb] fix!: 🐛 ✨ 💥 Set correct serviceName and add Password Update Job (#​30300)

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[LeoColomb]

Upgrade notes:

This major bump updates the MariaDB subchart to version 20.0.0. This subchart updates the StatefulSet objects serviceName to use a headless service, as the current non-headless service attached to it was not providing DNS entries. This will cause an upgrade issue because it changes "immutable fields". To workaround it, delete the StatefulSet objects as follows (replace the RELEASE_NAME placeholder):

kubectl delete sts RELEASE_NAME-mariadb --cascade=false

Then execute helm upgrade as usual.