Add missing runtime dependencies

We removed these in commit 5a3341d based on suggestions from a
review [1], however, it seems this was either bad guidance or the magic
sauce needed for this is not present in Copr (or locally, for that
matter). Since we removed these, we've dropped a dependency (six) and
added a new one (pyyaml) so things are slightly different.

Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

rpm/git-pw.spec

@@ -15,6 +15,11 @@ BuildRequires:  python3-setuptools
 BuildRequires:  python3-pytest
 
 Requires:       git
+Requires:       python3-arrow
+Requires:       python3-click
+Requires:       python3-requests
+Requires:       python3-tabulate
+Requires:       python3-pyyaml
 
 %description
 git-pw is a tool for integrating Git with Patchwork, the web-based patch