Lintian tag information: drop-python-version-declaration (type: warning)

Description (from lintian-explain-tags)

Your sources request a specific set of Python versions via the control field
X-Python3-Version but all declared autopkgtests exercise all supported
Python versions by using the command py3versions --supported.

The X-Python3-Version control field is not needed when sources work with
all Python versions currently supported.

Please refer to the py3versions(1) manual page and Bug#1001677 for
details.

Visibility: warning
Show-Always: no
Check: testsuite
Renamed from: query-requested-python-versions-in-test
query-declared-python-versions-in-test

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