[jdk21u] Integrated: 8315863: [GHA] Update checkout action to use v4

[Christian Stein]

On Fri, 8 Sep 2023 08:50:30 GMT, Christian Stein <cstein at openjdk.org> wrote:

> Hi all,
> 
> This pull request contains a backport of commit [b74805d3](https://github.com/openjdk/jdk/commit/b74805d38395ca8be9308d882bf6b84e93714849) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.
> 
> The commit being backported was authored by Christian Stein on 7 Sep 2023 and was reviewed by Aleksey Shipilev.
> 
> Thanks!

This pull request has now been integrated.

Changeset: 8565c710
Author:    Christian Stein <cstein at openjdk.org>
Committer: Aleksey Shipilev <shade at openjdk.org>
URL:       https://git.openjdk.org/jdk21u/commit/8565c71036b68aa1d41590420da444afc6aebdcc
Stats:     7 lines in 7 files changed: 0 ins; 0 del; 7 mod

8315863: [GHA] Update checkout action to use v4

Backport-of: b74805d38395ca8be9308d882bf6b84e93714849

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PR: https://git.openjdk.org/jdk21u/pull/146