Fix debian copyright file

[adombeck]

Fix issues found by licenserecon.

UDENG-8725

[adombeck]

@3v1n0 lrc lists these issues in files authored by you (and only you AFAICT):

LGPL-3           | LGPL-3+           pam/go-exec/module.c
LGPL-3           | GPL-3+            pam/internal/gdm/extensions/gdm-custom-json-pam-extension.h

Did you deviate on purpose from the LGPL-3 which we use for our other files? Why?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.64%. Comparing base (6ff09d2) to head (02ae33a).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1166   +/-   ##
=======================================
  Coverage   87.64%   87.64%           
=======================================
  Files          90       90           
  Lines        6222     6222           
  Branches      111      111           
=======================================
  Hits         5453     5453           
  Misses        713      713           
  Partials       56       56           

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[3v1n0]

@3v1n0 lrc lists these issues in files authored by you (and only you AFAICT):

LGPL-3           | LGPL-3+           pam/go-exec/module.c

Mh, IIRC we generally use (L)GPL-3+ on Canonical stuff, but I'm fine to stick with 3 if it makes things more consistent with the project, not really a big deal ATM.

LGPL-3           | GPL-3+            pam/internal/gdm/extensions/gdm-custom-json-pam-extension.h

This comes from upstream, so sticking with GPL-3+ there.

[adombeck]

Mh, IIRC we generally use (L)GPL-3+ on Canonical stuff, but I'm fine to stick with 3 if it makes things more consistent with the project, not really a big deal ATM.

Can we just remove the copyright notice from pam/go-exec/module.c to make it default to the ones from the repo?

This comes from upstream, so sticking with GPL-3+ there.

Who is upstream for pam/internal/gdm/extensions/gdm-custom-json-pam-extension.h? I don't see it mentioned anywhere in the file