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

[renovate[bot]]

This PR contains the following updates:

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

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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This PR has been generated by Mend Renovate. View repository job log here.

[0crat]

There is an unrecoverable failure on my side. Please, submit it here:

PID: 2@2bbd5c5b-50b8-4025-bacf-f1d2fc55ff81, thread: PQ-C63314D6Z
com.jcabi.xml.StrictXML[124] java.lang.IllegalArgumentException: 2 error(s) in XML document: -1:-1: cvc-pattern-valid: Value 'renovate[bot]' is not facet-valid with respect to pattern '[a-z0-9\-]{3,}' for type 'login'.;-1:-1: cvc-type.3.1.3: The value 'renovate[bot]' of element 'login' is not valid.

1.0-SNAPSHOT: CID: 3875dd17-86af-4763-9ffe-5e75bafce5d5, Type: "Job was added to WBS"

[yegor256]

@rultor please, try to merge, since 9 checks have passed

[rultor]

@rultor please, try to merge, since 9 checks have passed

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[rultor]

@rultor please, try to merge, since 9 checks have passed

@yegor256 Done! FYI, the full log is here (took me 10min)

[0crat]

Job gh:yegor256/cactoos#1701 is not assigned, can't get performer