Update all dependencies to v36.21.0

This MR contains the following updates:

Package	Type	Update	Change
docker.io/renovate/renovate		minor	36.19.2 -> 36.21.0
renovate/renovate	ironbank-docker	minor	36.19.2-slim -> 36.21.0-slim
renovate/renovate	stage	minor	36.19.2-slim -> 36.21.0-slim

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Release Notes

renovatebot/renovate

v36.21.0

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Features

• add hash util (#​23524) (1b93263)

Documentation

• update references to renovate/renovate to v36.20.1 (#​23525) (68e871e)

Code Refactoring

• rubygems: Extract v1 API handling (#​23474) (0e2083e)
• rubygems: Unify fetching via v1 API (#​23517) (3559cb3)

Tests

• rubygems: Simplify tests (#​23521) (285bed3)

v36.20.1

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Bug Fixes

• github: Remote branch existence check (#​23480) (9e77d59)

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This MR has been generated by Renovate Bot.