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

[henry-pa-bot]

This PR contains the following updates:

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

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This PR has been generated by Renovate Bot.

[henry-pa-bot]

🦙 MegaLinter status: ❌ ERROR

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
❌ ACTION	actionlint	7		2	0.1s
✅ COPYPASTE	jscpd	yes		no	2.12s
✅ REPOSITORY	git_diff	yes		no	0.02s
✅ REPOSITORY	secretlint	yes		no	1.9s
✅ YAML	prettier	7		0	0.66s
✅ YAML	yamllint	7		0	0.42s

See detailed report in MegaLinter reports
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