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nixos/tests/xmpp: fix after xmpp >= 1.9
`ClientXMPP.process` is gone but trivial to diy in our case. see https://slixmpp.readthedocs.io/en/latest/howto/remove_process.html
`ClientXMPP.process` is gone but trivial to diy in our case. see https://slixmpp.readthedocs.io/en/latest/howto/remove_process.html