publish: getsentry/sentry@21.6.0

[getsentry-release]

Requested by: @BYK

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Targets

• docker[release]
• docker[latest]
• pypi
• github

[github-actions]

Publishing: run#940138228

[github-actions]

Failed to publish. (error logs)

Bad branch? You can delete with ease and start over.

[BYK]

Deleted Docker tags, will do a re-release with getsentry/sentry#26632 in place.