pgsql: Adjust locations which have an incorrect copyright year

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

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/7fc26d11e370afe237631265714221364d7e7910

Modified Files
--------------
contrib/pageinspect/gistfuncs.c             | 2 +-
src/backend/access/brin/brin_bloom.c        | 2 +-
src/backend/access/brin/brin_minmax_multi.c | 2 +-
src/backend/rewrite/rewriteSearchCycle.c    | 2 +-
src/backend/utils/adt/jsonbsubs.c           | 2 +-
src/common/hex.c                            | 2 +-
src/common/hmac.c                           | 2 +-
src/common/hmac_openssl.c                   | 2 +-
src/common/sha1.c                           | 2 +-
src/common/sha1_int.h                       | 2 +-
src/include/common/hex.h                    | 2 +-
src/include/common/hmac.h                   | 2 +-
src/include/common/sha1.h                   | 2 +-
src/include/port/pg_iovec.h                 | 2 +-
src/include/rewrite/rewriteSearchCycle.h    | 2 +-
15 files changed, 15 insertions(+), 15 deletions(-)