[clang-tools-extra] [clangd] Add tweak to inline concept requirements (PR #69693)

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5chmidti wrote:

Clangd (actually large parts of llvm) don't use trailing return types, you will probably have to change those. This is a bit of a chore, so you could wait for another reviewer to confirm that for you.

https://github.com/llvm/llvm-project/pull/69693