Stabilize tests some more

Álvaro Herrera <alvherre@kurilemu.de>

Commit: a4a0fa0c7587eb05b36c1f184d966dd5524a4b74
Author: Álvaro Herrera <alvherre@kurilemu.de>
Date: 2025-12-05T15:16:27Z
Stabilize tests some more

Tests added by commits 90eae926abbb, 2bc7e886fc1b, bc32a12e0db2
have occasionally failed, depending on timing.  Add some dependency
markers to the spec to try and remove the instability.

Author: Mihail Nikalayeu <mihailnikalayeu@gmail.com>
Discussion: https://postgr.es/m/202512041739.sgg3tb2yobe2@alvherre.pgsql

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