chore: update dependency stylelint-header to v3

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
stylelint-header	^2.1.0 -> ^3.0.0

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Release Notes

castastrophe/stylelint-header (stylelint-header)

v3.0.0

Compare Source

• feat!: drop support for node v20 and stylelint v15 (abdbc74)

BREAKING CHANGES

• dropping support for legacy node v20 and stylelint v15

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[github-actions]

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[castastrophe]

This was an update to drop old dependencies that we don't use. Pulled this down and it's looking good - no regressions.