Fix some issues reported by lintian

Fix some issues reported by lintian

• Use versioned copyright format URI. (unversioned-copyright-format-uri)
• Remove unnecessary X-Python{,3}-Version field in debian/control. (ancient-python-version-field)
• Bump debhelper from old 11 to 12. (package-uses-old-debhelper-compat-version)

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Build and test logs for this branch can be found at https://janitor.debian.net/lintian-fixes/pkg/glogic/fa14dff0-3cd9-49cf-8e16-aa19f84705e1.

Debdiff

These changes affect the binary packages:

File lists identical (after any substitutions)

Control files: lines which differ (wdiff format)

• Depends: python3:any (>= 3.1~), python3:any, python3-gi, python3-gi-cairo, gir1.2-gtk-3.0

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