Remove unused latch

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 6c0c49f7d37dc29775947ac6edbc494c32f43fa6
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2024-10-05T12:09:27Z
Releases: 18.0
Remove unused latch

It was left unused by commit bc971f4025, which replaced the latch
usage with a condition variable

Discussion: https://www.postgresql.org/message-id/391abe21-413e-4d91-a650-b663af49500c@iki.fi

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