[clang-tools-extra] [clangd] fix compilation errors with newer versions of gRPC (PR #67258)

[Thibault Monnier via cfe-commits]

Thibault-Monnier wrote:

Thanks. I've triggered the rebuilds: https://lab.llvm.org/buildbot/#/builders/169/builds/19516 and https://lab.llvm.org/buildbot/#/builders/55/builds/23522.

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https://github.com/llvm/llvm-project/pull/67258