adjust dblink regression expected output for commit 5da9868ed9

Bruce Momjian <bruce@momjian.us>

Commit: 9ee7d533dacf8594057ced2d016250f09056c284
Author: Bruce Momjian <bruce@momjian.us>
Date: 2021-03-30T23:46:31Z
Releases: 14.0
adjust dblink regression expected output for commit 5da9868ed9

Seems the -1/singular output is used in the dblink regression tests.

Reported-by: Álvaro Herrera

Discussion: https://postgr.es/m/20210330231506.GA10666@alvherre.pgsql

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contrib/dblink/expected/dblink.out modified +3 −3

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Cited messages not in the archive: 20210330231506.GA10666@alvherre.pgsql