[openssl/openssl] ee60a4: Bump actions/checkout from 2 to 4

[dependabot[bot]]

  Branch: refs/heads/OpenSSL_1_1_1-stable
  Home:   https://github.com/openssl/openssl
  Commit: ee60a4964ad403be86dcf7a8710691bf8dc0bc16
      https://github.com/openssl/openssl/commit/ee60a4964ad403be86dcf7a8710691bf8dc0bc16
  Author: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
  Date:   2023-09-05 (Tue, 05 Sep 2023)

  Changed paths:
    M .github/workflows/ci.yml
    M .github/workflows/cross-compiles.yml
    M .github/workflows/run-checker-ci.yml
    M .github/workflows/run-checker-daily.yml
    M .github/workflows/run-checker-merge.yml
    M .github/workflows/windows.yml

  Log Message:
  -----------
  Bump actions/checkout from 2 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support at github.com>

CLA: trivial

Reviewed-by: Hugo Landau <hlandau at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21953)

(cherry picked from commit d4231af60a8d04196b3b873c2fa8638daff36173)