deps: update elasticsearch docker tag to v19.21.2

[renovate]

This PR contains the following updates:

Package	Update	Change
elasticsearch (source)	minor	19.19.4 -> 19.21.2
elasticsearch (source)	minor	19.13.15 -> 19.21.2

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Release Notes

bitnami/charts (elasticsearch)

v19.21.2

• Fix elasticsearch metric es.uri template (#​24039) (9b9b518), closes #​24039

v19.21.1

• Fix elasticsearch shared initContainers rendering (#​24005) (31069b2), closes #​24005

v19.21.0

• [bitnami/elasticsearch] feat: ✨ 🔒 Add readOnlyRootFilesystem support (#​23779) (86ee2e8), closes #​23779

v19.20.0

• [bitnami/elasticsearch] feat: ✨ 🔒 Add automatic adaptation for Openshift restricted-v2 (7888f4c), closes #​24078

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