[clang] [clang][Sema] Skip the RequiresExprBodyDecls for lambda dependencies (PR #83997)

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alexfh wrote:

I have a reduced test case, which is accepted by clang 18, but fails with this patch: https://gcc.godbolt.org/z/zMbKvsf7K

https://github.com/llvm/llvm-project/pull/83997