[llvm] Fix validate checkout (PR #210471)

[Tom Stellard via llvm-commits]

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@@ -62,14 +62,19 @@ concurrency:
 jobs:
   setup-variables:
     if: >-
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tstellar wrote:

This was part of a commit I was using to debug this action, so I've removed it.

https://github.com/llvm/llvm-project/pull/210471