build: Updating mediawiki/mediawiki-codesniffer to 29.0.0

Additional changes:
* Also sorted "composer fix" command to run phpcbf last.

Change-Id: Ie549c7c984457f6ff85315cfec2e3739558f6017

ContributionScores_body.php

@@ -213,7 +213,7 @@ class ContributionScores extends IncludableSpecialPage {
 		if ( empty( $limit ) || $limit < 1 || $limit > CONTRIBUTIONSCORES_MAXINCLUDELIMIT ) {
 			$limit = 10;
 		}
-		if ( is_null( $days ) || $days < 0 ) {
+		if ( $days === null || $days < 0 ) {
 			$days = 7;
 		}