Adjust locations which have an incorrect copyright year

David Rowley <drowley@postgresql.org>

Commit: 7fc26d11e370afe237631265714221364d7e7910
Author: David Rowley <drowley@postgresql.org>
Date: 2021-06-04T00:19:50Z
Releases: 14.0
Adjust locations which have an incorrect copyright year

A few patches committed after ca3b37487 mistakenly forgot to make the
copyright year 2021.  Fix these.

Discussion: https://postgr.es/m/CAApHDvqyLmd9P2oBQYJ=DbrV8QwyPRdmXtCTFYPE08h+ip0UJw@mail.gmail.com

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