main/duplicity: upgrade to 0.8.12.1612

This commit also fixes the shebang line.

Before this change:

    $ dabuild sh
    $ sudo apk add duplicity >/dev/null && duplicity --version
    env: can't execute 'python': No such file or directory
    $ head -n 1 /usr/bin/duplicity
    #!/usr/bin/env python

After this change:

    $ dabuild sh
    $ sudo apk add duplicity >/dev/null && duplicity --version
    duplicity 0.8.12
    $ head -n 1 /usr/bin/duplicity
    #!/usr/bin/env python3

Removed the smoke test to bring check() in line with the policy from the
wiki: https://wiki.alpinelinux.org/wiki/APKBUILD_Reference#options

> Creating a very simple check function, that calls program --version is
> worse than disabling tests completely because it gives the false
> impression that the package is thoroughly tested with the testsuite from
> upstream. [2]

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