[issue26063] Update copyright in the devguide

[Roundup Robot]

Roundup Robot added the comment:

New changeset ac2b3bafd41c by Ezio Melotti in branch 'default':
#26063: update copyright.  Patch by Chris Gonzalez.
https://hg.python.org/devguide/rev/ac2b3bafd41c

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nosy: +python-dev

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