[llvm] [Github] Fix revisions in code format action reproducers (PR #155193)

[Baranov Victor via llvm-commits]

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@@ -38,7 +38,7 @@ jobs:
         uses: actions/checkout at 08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           repository: ${{ github.repository }}
-          ref: ${{ github.base_ref }}
+          ref: ${{ github.ref }}
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vbvictor wrote:

Is this for testing or it should be preferred? (asking if I should change in `pr-code-lint`)

https://github.com/llvm/llvm-project/pull/155193