Maybe add a changelog entry for the headers thing?

I thought of this, but we would only add it for python/js/rust
I think it's better to add the changelog about headers once we have it for all of the libs

Are you sure? I didn't see a change for Rust, I think it existed there already. So it could exist in other languages too.

Maybe not rust, but I know it doesn't exist on the other languages because they were generated before the headers field was added to openapi.json
And CI does not complain about changes because other languages are not part of our regen_openapi.sh