pgsql: Set client encoding to UTF8 for the citext regression script

Set client encoding to UTF8 for the citext regression script

Problem introduced with non-ascii characters in commit f2464997644c
and discovered on various buildfarm animals.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/890faaf1957759c6e17fbcbfd16f7cabc4a59d07

Modified Files
--------------
contrib/citext/expected/citext.out | 2 ++
contrib/citext/expected/citext_1.out | 2 ++
contrib/citext/sql/citext.sql | 3 +++
3 files changed, 7 insertions(+)

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