Bug#1076534: src:importlib-resources: fails to migrate to testing for too long: autopkgtest regression on s390x

[Graham Inggs]

I didn't find a bug filed for the autopkgtest regression, so I'll just
leave a note here.

This was fixed upstream:

https://github.com/python/importlib_resources/commit/ca5f0e1ca8fbc8c2a4e06a25f2da3df9e4ac1571