fix: update helm release mariadb to v18.2.6

[sebastien-prudhomme]

This PR contains the following updates:

Package	Update	Change
mariadb (source)	patch	18.2.4 -> 18.2.6

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Release Notes

bitnami/charts (mariadb)

### [`v18.2.6`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/mariadb/CHANGELOG.md#small1826-2024-07-02-small) - \[bitnami/mariadb] Release 18.2.6 ([#​27638](https://togithub.com/bitnami/charts/issues/27638)) ([9822f43](https://togithub.com/bitnami/charts/commit/9822f43757bbf85d48db29c9e0c39ae4825e436b)), closes [#​27638](https://togithub.com/bitnami/charts/issues/27638) ### [`v18.2.5`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/mariadb/CHANGELOG.md#small1825-2024-07-01-small) - \[bitnami/\*] Update README changing TAC wording ([#​27530](https://togithub.com/bitnami/charts/issues/27530)) ([52dfed6](https://togithub.com/bitnami/charts/commit/52dfed6bac44d791efabfaf06f15daddc4fefb0c)), closes [#​27530](https://togithub.com/bitnami/charts/issues/27530) - \[bitnami/mariadb] Release 18.2.5 ([#​27619](https://togithub.com/bitnami/charts/issues/27619)) ([41836cc](https://togithub.com/bitnami/charts/commit/41836ccc60bd99a45185b0e33e2ca5970867e886)), closes [#​27619](https://togithub.com/bitnami/charts/issues/27619)

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