Fix typo in foreign_key.sql

Michael Paquier <michael@paquier.xyz>

Commit: d0c12b98f2bf741a57915bd59084b16fd03d1468
Author: Michael Paquier <michael@paquier.xyz>
Date: 2025-08-02T10:54:27Z
Releases: 18.0
Fix typo in foreign_key.sql

Introduced by eec0040c4bcd.

Author: Chao Li <lic@highgo.com>
Discussion: https://postgr.es/m/CAEoWx2kKMdtWKQiYNuwG2L41YwHA7G3sUsRfD9esPJwZyX1+Eg@mail.gmail.com
Backpatch-through: 18

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