Raise a timeout to 180s, in test 010_logical_decoding_timelines.pl.

Noah Misch <noah@leadboat.com>

Commit: f9e35ff236c9d12c4c30a17f2c09cad56dbf65bb
Author: Noah Misch <noah@leadboat.com>
Date: 2021-05-31T07:30:38Z
Releases: 10.18
Raise a timeout to 180s, in test 010_logical_decoding_timelines.pl.

Per buildfarm member hornet.  Also, update Pod documentation showing the
lower value.  Back-patch to v10, where the test first appeared.

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