chore(deps): update actions/checkout digest to b4ffde6

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	digest	8ade135 -> b4ffde6

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[midnight-bot-6658]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ ACTION	actionlint	6		5	0.13s
✅ COPYPASTE	jscpd	yes		no	2.25s
✅ REPOSITORY	git_diff	yes		no	0.03s
✅ REPOSITORY	secretlint	yes		no	2.61s
✅ YAML	prettier	6		0	0.64s
✅ YAML	yamllint	6		0	0.33s

See detailed report in MegaLinter reports
Set VALIDATE_ALL_CODEBASE: true in mega-linter.yml to validate all sources, not only the diff

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