Revert "MT#57855 requirements: stick with python-debian 0.1.48"

This reverts commit 1e2026769e.

This isn't a problem with python-debian, but in setuptools
itself, see https://bugs.debian.org/1041091

Change-Id: I0cef0bc444aa07060b07a1d7ca5a2301c77cd602

requirements/common.txt

@@ -19,7 +19,7 @@ drf-spectacular
 flower>=0.9.5
 markdown
 natsort
-python-debian<0.1.49
+python-debian
 PyYAML
 requests
 six>=1.9