/usr/share/mediawiki-extensions/openid/patches/patch-drop_non_multiple_key_index_uoi_user.sql is in mediawiki-extensions-openid 3.6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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-- SQL schema update for OpenID extension to drop uoi_user field because it is unique
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ALTER TABLE /*_*/user_openid DROP INDEX uoi_user;
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