[jdk17u-dev] RFR: 8315863: [GHA] Update checkout action to use v4

[Aleksey Shipilev]

Clean backport to improve GHA reliability.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport b74805d38395ca8be9308d882bf6b84e93714849

Changes: https://git.openjdk.org/jdk17u-dev/pull/1753/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1753&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315863
  Stats: 7 lines in 7 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1753.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1753/head:pull/1753

PR: https://git.openjdk.org/jdk17u-dev/pull/1753