gnu: deja-dup: Update to 40.6.

gnu: deja-dup: Update to 40.6.

* gnu/packages/gnome.scm (deja-dup): Update to 40.6.
[origin]: Use gitlab.gnome.org since the project migrated away from
launchpad.
[home-page]: Use 'wiki.gnome.org' instead of 'launchpad.net'.
[build-system]: Switch to 'meson-build-system' because upstream removed
cmake support.
[arguments]: Enable tests.  Remove arguments 'modules',
'imported-modules' and 'test-target'.  Use argument 'glib-or-gtk?'.
Replace configure-flags to only adjust 'RUN_PATH'.  Use standard phases
for 'configure' and 'check'.  Adjust and rename phase
'patch-lockfile-deletion' to 'patch-paths'.  Add phases
'patch-libgpg-error' and 'skip-gtk-update-icon-cache'.
[inputs]: Remove 'libpeas', 'gobject-introspection'.  Replace 'python-2'
and 'python2-pygobject' with python-3 versions. Add 'json-glib',
'libsoup' and 'libgpg-error'.
[native-inputs]: Remove 'cmake-minimal' and 'intltool'.  Add
'appstream-glib','desktop-file-utils', 'glib:bin' and
'gobject-introspection'.
* gnu/packages/patches/deja-dup-use-ref-keyword-for-iter.patch: Delete
file.