Fix the dates of some copyright notices

Michael Paquier <michael@paquier.xyz>

Commit: 7597cc3083f8b3607123f71bc6432afc5a655d6e
Author: Michael Paquier <michael@paquier.xyz>
Date: 2022-04-11T07:36:25Z
Releases: 15.0
Fix the dates of some copyright notices

0ad8032 and 4e34747 are at the origin of that.  Julien has found the one
in parse_jsontable.c, while I have spotted the rest.

Author: Julien Rouhaud, Michael Paquier
Discussion: https://postgr.es/m/20220411060838.ftnzyvflpwu6f74w@jrouhaud

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