Bump line length to 120 characters

When updating PHPCS, it started complaining about several overlong
lines; using the PSR-12 [1] limit, 120, silences those warnings.

[1]: https://www.php-fig.org/psr/psr-12/

Bug: T253636

Author: lucaswerkmeister

.phpcs.xml

@@ -4,7 +4,7 @@
 
 	<rule ref="Generic.Files.LineLength">
 		<properties>
-			<property name="lineLimit" value="115" />
+			<property name="lineLimit" value="120" />
 		</properties>
 	</rule>