/usr/share/postgresql/10/extension/citext--1.2--1.3.sql is in postgresql-10 10.6-0ubuntu0.18.04.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | /* contrib/citext/citext--1.2--1.3.sql */
-- complain if script is sourced in psql, rather than via ALTER EXTENSION
\echo Use "ALTER EXTENSION citext UPDATE TO '1.3'" to load this file. \quit
UPDATE pg_aggregate SET aggcombinefn = 'citext_smaller'
WHERE aggfnoid = 'min(citext)'::pg_catalog.regprocedure;
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