[issue34005] Replace inspect.formatargspec by inspect.signature in xmlrpc module

[Rémi Lapeyre]

Change by Rémi Lapeyre <remi.lapeyre at henki.fr>:


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components: +Library (Lib), XML
versions: +Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34005>
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