[llvm] [Github] Switch back to tj-actions/changed-files (PR #158335)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

> What's the benefit of doing this?

We're not relying on a fork that we don't control for this. The development cadence of the fork is relatively slow (eg new release a month after upstream) and something I'd rather not rely on in the interim before we hopefully create our own action that does something similar.

https://github.com/llvm/llvm-project/pull/158335