Update Helm release mariadb to v18.2.6

This MR contains the following updates:

Package	Update	Change
mariadb (source)	patch	18.2.5 -> 18.2.6

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Release Notes

bitnami/charts (mariadb)

v18.2.6

• [bitnami/mariadb] Release 18.2.6 (#​27638)

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