Bug#1018822: Exceptions on Python 3.8

[Jelmer Vernooij]

package: python3-debian
severity: important
thanks

I'm get exceptions importing the _deb822_repo module on Python 3.8:

   File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/debian/copyright.py", line 58, in <module>
    from debian._deb822_repro import (
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/debian/_deb822_repro/__init__.py", line 166, in <module>
    from debian._deb822_repro.parsing import (
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/debian/_deb822_repro/parsing.py", line 12, in <module>
    from debian._deb822_repro._util import (combine_into_replacement, BufferingIterator,
  File "/opt/hostedtoolcache/Python/3.8.13/x64/lib/python3.8/site-packages/debian/_deb822_repro/_util.py", line 120, in <module>
    _bufferingIterator_Base = collections.abc.Iterator[T]
TypeError: 'ABCMeta' object is not subscriptable

The odd thing is that both 3.7 and 3.9 work fine.
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