[clang] [Clang][Sema] Tweak tryCaptureVariable for unevaluated lambdas (PR #93206)

[Younan Zhang via cfe-commits]

zyn0217 wrote:

+1 for being too late because 18.1.7 just got rolled out a few days ago (I thought 18.1.6 was the final version of 18.x!), and there's probably no 18.1.8.

https://github.com/llvm/llvm-project/pull/93206