Use specific collation where needed in new test

Álvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 17bcf4f5450430f67b744c225566c9e0e6413e95
Author: Álvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2025-04-07T19:58:06Z
Releases: 18.0
Use specific collation where needed in new test

Oversight in commit a379061a22a8.

Per Czech buildfarm members jay and hippopotamus.

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