[Debian-med-packaging] Bug#1000814: python-cooler: 10 test failures with pandas 1.3: TypeError: 'IOHandles' object is not subscriptable

[Rebecca N. Palmer]

Package: python3-cooler
Version: 0.8.8-1
Severity: important
Control: block 999415 by -1

With pandas 1.3 from experimental, 10 additional tests fail (as well as 
the 2 in #979625), all with the error

TypeError: 'IOHandles' object is not subscriptable

Full log: 
https://ci.debian.net/data/autopkgtest/unstable/amd64/p/python-cooler/17019213/log.gz