Update mediawiki/codesniffer to 42.0.0

Two main changes:

- list() to []. Several IDEs already started autofixing this on save,
  introducing unrelated noise into random commits, so I’m glad to get
  this over with.
- Nicer PHPUnit usage (less ->will()). I had previously done something
  similar in change Iac24de03f2 (commit 8c44612b9f), but doing it in
  phpcs is of course more thorough and ensures it doesn’t regress.

The MediaWiki.WhiteSpace.DisallowEmptyLineFunctions rule was replaced
with Squiz.WhiteSpace.FunctionOpeningBraceSpace upstream, so just update
our exclusion for that.

Two new phpcs rules are suppressed, the $wgHooks one hopefully only
temporarily. Also, I manually fixed the indentation in
BaseUriExtractorTest.php and EntityLinkFormatterFactoryTest.php.

Change-Id: I4cb9b54d227119d5febe6331689df1be515f2ec7

Author: lucaswerkmeister

src/Entity/EntityIdValue.php

@@ -81,7 +81,7 @@ public function unserialize( $serialized ) {
 			return;
 		}
 
-		list( $entityType, $numericId ) = $array;
+		[ $entityType, $numericId ] = $array;
 
 		try {
 			$entityId = LegacyIdInterpreter::newIdFromTypeAndNumber( $entityType, $numericId );

src/Snak/PropertyValueSnak.php

@@ -109,7 +109,7 @@ public function __serialize(): array {
 	}
 
 	public function __unserialize( array $serialized ): void {
-		list( $propertyId, $this->dataValue ) = $serialized;
+		[ $propertyId, $this->dataValue ] = $serialized;
 
 		if ( is_string( $propertyId ) ) {
 			$this->propertyId = new NumericPropertyId( $propertyId );

tests/unit/Statement/StatementListTest.php

@@ -45,15 +45,15 @@ private function getStatement(
 
 		$statement->expects( $this->any() )
 			->method( 'getGuid' )
-			->will( $this->returnValue( $guid ) );
+			->willReturn( $guid );
 
 		$statement->expects( $this->any() )
 			->method( 'getPropertyId' )
-			->will( $this->returnValue( new NumericPropertyId( $propertyId ) ) );
+			->willReturn( new NumericPropertyId( $propertyId ) );
 
 		$statement->expects( $this->any() )
 			->method( 'getRank' )
-			->will( $this->returnValue( $rank ) );
+			->willReturn( $rank );
 
 		return $statement;
 	}