Remove MediaWiki patches after upstream merge

[Mic92]

We are currently carrying two patches for MediaWiki 1.45.0:

Patches

1. PostgresInstaller: Handle null password in openConnectionToAnyDB

   • Upstream: https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1231289
   • Bug: https://phabricator.wikimedia.org/T414884
   • Issue: When using peer authentication, the password may be null causing a type error

2. migrateLinksTable: Fix categorylinks migration with literal namespace

   • Upstream: https://gerrit.wikimedia.org/r/c/mediawiki/core/+/1231290
   • Issue: The categorylinks table mapping uses a literal integer (14 = NS_CATEGORY) for the 'ns' field instead of a column name, causing:
     • Undefined array key 14 when trying to fetch $row[14]
     • SQL syntax error AND () AND when building the WHERE clause

Action Required

Once these patches are merged upstream and included in a MediaWiki release, we should:

1. Update to the new MediaWiki version
2. Remove the patches from pkgs/
3. Update modules/nixos-wiki/default.nix to remove the patchedMediawiki override