package/postgresql: fix legal info

Commit 57e297a215193c92f6a178139db53616f2ee23b5 forgot to update hash of
COPYRIGHT file (year updated with
https://github.com/postgres/postgres/commit/1fbcb1360bc19b89369209203ea7cc19b8cde224)

Fixes:
 - http://autobuild.buildroot.org/results/93f40dc71619745ddc6741598c9a488c81ea440f

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Maxim Kochetkov <fido_max@inbox.ru>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/postgresql/postgresql.hash

@@ -1,4 +1,4 @@
 # From https://ftp.postgresql.org/pub/source/v15.2/postgresql-15.2.tar.bz2.sha256
 sha256  99a2171fc3d6b5b5f56b757a7a3cb85d509a38e4273805def23941ed2b8468c7  postgresql-15.2.tar.bz2
 # License file, Locally calculated
-sha256  f6d6616acdb598742e2a7c64fa0551c1c72c309d279fd2d90370e5fdd41c8945  COPYRIGHT
+sha256  1a7d13c3ab31961b91ba256f77d6e82e0b54bf992253060fe93bdb5466df416a  COPYRIGHT