PR creation failing due to spurious "workflow file change" that isn't real

[dsyme]

Here's another failure where a PR creation failed due to workflow file update

https://github.com/fsprojects/FSharp.Control.AsyncSeq/actions/runs/22231625810/job/64313898613

However the patch preview in this case clearly has no updates to the workflow file. 

https://github.com/fsprojects/FSharp.Control.AsyncSeq/actions/runs/22231625810/job/64313898613#step:8:81

So we definitely have a bug of some kind here

[dsyme]

There's another case here: https://github.com/copilot-community-sdk/copilot-sdk-clojure/actions/runs/22228916982/job/64303882886#step:8:75

[dsyme]

Fixed in #18175 (we hope, testing is hard for theis area)