chore(deps): update registry-1.docker.io/bitnamicharts/elasticsearch docker tag to v21.2.6

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
registry-1.docker.io/bitnamicharts/elasticsearch (source)	patch	21.2.5 -> 21.2.6

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[!WARNING] Some dependencies could not be looked up. Check the warning logs for more information.

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Release Notes

bitnami/charts (registry-1.docker.io/bitnamicharts/elasticsearch)

### [`v21.2.6`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/elasticsearch/CHANGELOG.md#2126-2024-06-24) - \[bitnami/elasticsearch] Fix ingress backend declaration name ([#​27149](https://togithub.com/bitnami/charts/pull/27149))

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