Revert "[GitHub][workflows] Use latest clang-format version 18.1.1 (#85502)"

This reverts commit dec63221.

This probably needs more discussion before we can land it. The consensus
(from what I can gather) in https://discourse.llvm.org/t/rfc-clang-format-all-the-things/76614
is that we should be careful with version upgrades for consistency.