fix: autoupdate is broken due to changed GHA behaviour

[escaped]

The auto update does not work anymore. Unfortunately, the pipeline is still reported as successfully... thus we have to manually update all repositories.

This solution is much much simpler and has not external dependency. See UnicornGlobal/has-changes-action#5 for more information.

[somidad]

@escaped I posted the solution in the referenced issue. For information, git status --porcelain | wc -l returns the number of untracked and modified files.

So if the following step checks like if: steps.changes.outputs.changed == 1, it only checks whether the number of untracked and modified files is equal to 1. So I believe, if there is no particular corner case, it should be changed != 0 or changed > 0, in general.