fix(deps): update ghcr.io/renovatebot/renovate docker tag to v37.421.6

This MR contains the following updates:

Package	Update	Change
ghcr.io/renovatebot/renovate (source)	patch	37.421.5 -> 37.421.6
ghcr.io/renovatebot/renovate (source)	patch	37.421.5-slim -> 37.421.6-slim

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Release Notes

renovatebot/renovate (ghcr.io/renovatebot/renovate)

v37.421.6

Compare Source

Documentation

• versioning/semver: rewrite readme (#​29868) (1fcec7c)

Miscellaneous Chores

• deps: update ghcr.io/containerbase/devcontainer docker tag to v10.13.0 (#​29966) (f05bf76)

Build System

• deps: update dependency jsonc-parser to v3.3.0 (#​29969) (cf988e5)
• deps: update dependency jsonc-parser to v3.3.1 (#​29970) (f19afb4)

Continuous Integration

• fix cache keys (#​29962) (174b1bf)
• setup-node: fix steps order (#​29965) (a0c447a)
• use node v20 for most jobs (#​29959) (6d01a1d)

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