Update schema-registry Docker tag to v21 - autoclosed

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
schema-registry (source)	HelmChart	major	19.2.1 -> 21.0.3

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Release Notes

bitnami/charts (schema-registry)

v21.0.3

• [bitnami/schema-registry] Release 21.0.3 (#​30190)

v21.0.2

• [bitnami/schema-registry] Release 21.0.2 (#​29596) (a63864e), closes #​29596

v21.0.1

• [bitnami/schema-registry] Release 21.0.1 (#​29370) (6d9c981), closes #​29370
• [schema-registry] Fix typo in README: envVars -> extraEnvVars (#​27564) (46cae1c), closes #​27564

v21.0.0

• [bitnami/schema-registry] Update chart dependency (kafka) (#​28672) (ff628f6), closes #​28672

v20.0.0

• [bitnami/schema-registry] Release 20.0.0 (#​28641) (b6f2246), closes #​28641

v19.2.5

• [bitnami/schema-registry] Release 19.2.5 (#​28488) (faf51a1), closes #​28488

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