Update actions/checkout action to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v2 -> v3

---

Release Notes

actions/checkout

v3

Compare Source

• Use @​actions/core saveState and getState
• Add github-server-url input

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

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

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

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

[0crat]

@renovate/z[bot] this pull request is too small, just 6 lines changed (less than 10), there will be no formal code review, see §53 and §28; in the future, try to make sure your pull requests are not too small; @yegor256/z please review this and merge or reject

[yegor256]

@rultor please, try to merge

[yegor256]

@rultor merge

[rultor]

@rultor please, try to merge

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

[rultor]

@rultor please, try to merge

@yegor256 Done! FYI, the full log is here (took me 3min)

[rultor]

@rultor merge

@renovate[bot] @yegor256 The pull request is closed already, so I can't merge it

[rultor]

@rultor merge

@yegor256 I'm sorry, I don't understand you :( Check this page and try again please

[0crat]

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

PID: 4@f176822d-48e4-4760-8595-7f509257822f, thread: PQ-C3RFVLU72
com.zerocracy.farm.strict.StrictProject[122] java.lang.IllegalArgumentException: File "blanks/renovate[bot].xml" is not accessible in "PMO"

1.0-SNAPSHOT: CID: 72e44514-6073-468c-b8ca-89fc5b8c76cf, Type: "Close job"

[0crat]

Job gh:yegor256/xcop#35 is not assigned, can't get performer