Lintian tag information: script-uses-unversioned-python-in-shebang (type: error)

Description (from lintian-explain-tags)

This package contains a script with unversioned Python shebang.

This package contains a script with unversioned Python shebang and thus
defaults to using Python 2. The 2.x series of Python is deprecated and
apart from rare cases, will not be supported in Debian Bullseye.

If the script in question is compatible with Python 3, please modify it to
use /usr/bin/python3 instead. If it only is Python 2 compatible, please
modify it to use /usr/bin/python2.

Visibility: error
Show-Always: no
Check: languages/python/scripts

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