[jdk11u-dev] RFR: 8315863: [GHA] Update checkout action to use v4

[Aleksey Shipilev]

On Wed, 20 Sep 2023 09:15:42 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> Semi-clean backport to improve GHA reliability. It does not apply cleanly, because the relevant block for GTest acquisition is missing in 11u.
> 
> Additional testing:
>  - [x] GHA

> @shipilev Changes in this repository do not require maintainer approval.

All right then! (misleading message, huh)

Push approval granted.

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PR Comment: https://git.openjdk.org/jdk11u-dev/pull/2135#issuecomment-1727784425
PR Comment: https://git.openjdk.org/jdk11u-dev/pull/2135#issuecomment-1727785699