Revert "build: upgrade clang-format to v18"
This reverts commit c3e1c31b.
@wasm-fmt/clang-format
outputs incomplete env.cc
(81K) or node_contextify.cc
(69K) with any changes in it.
Refs: https://github.com/nodejs/node/pull/54993#issuecomment-2358599938 Refs: https://github.com/nodejs/node/pull/53957