fix(deps): update renovate/renovate docker tag to v34.21.1

This MR contains the following updates:

Package	Update	Change
renovate/renovate	patch	34.21.0 -> 34.21.1

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Release Notes

renovatebot/renovate

v34.21.1

Bug Fixes

• datasource/sbt-package: Fallbacks to maven when no sbt directory listing available (#​18590) (8433ad9)

Documentation

• asdf: rewrite readme (#​18795) (64ddabc)

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