[llvm] [Github] Force files changed step in docs action to use GH API (PR #69763)

[Aiden Grossman via llvm-commits]

boomanaiden154 wrote:

I'll make sure to do some experimentation with the code formatting action. It seems like it tries to only fetch the commits between main and the tip of the PR, but it doesn't make sense why that takes 10 minutes on average. I'll play around with it and see what I can get working. It doesn't matter for the documentation since we only need the state after the top commit to test the build.

Enjoy your weekend!

https://github.com/llvm/llvm-project/pull/69763