[clang] [clang-format] Fix a bug in annotating CastRParen (PR #102261)

[Owen Pan via cfe-commits]

owenca wrote:

> I'm sorry I'm not familiar with LLVM release cycle, but is it too late for this to make it into the `release/19.x` branch?

It's not too late, but in general we backport bug fixes only if the bugs are labeled as `invalid-code-generation`, `crash-on-valid`, or `regression`. In this particular case though, the fix is localized and fairly simple, and has been approved by all clang-format maintainers, so I've decided to backport it to 19.x per your request.

https://github.com/llvm/llvm-project/pull/102261