Benjamin Drung 21784052ba test: Fix deprecated return value for test case
```
ubuntutools/test/test_archive.py::LocalSourcePackageTestCase::test_pull
  /usr/lib/python3.11/unittest/case.py:678: DeprecationWarning: It is deprecated to return a value that is not None from a test case (<bound method LocalSourcePackageTestCase.test_pull of <ubuntutools.test.test_archive.LocalSourcePackageTestCase testMethod=test_pull>>)
    return self.run(*args, **kwds)
```

`test_pull` does not need to be run directly. Make it private.

Signed-off-by: Benjamin Drung <benjamin.drung@canonical.com>
2023-01-31 17:39:12 +01:00
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