build: Updating mediawiki/mediawiki-codesniffer to 22.0.0

And updating CoC link to use Special:MyLanguage (T202047).

Change-Id: I183c310e7be2979a7d6e118eacb12a18cff479cc

CODE_OF_CONDUCT.md

@@ -1 +1 @@
-The development of this software is covered by a [Code of Conduct](https://www.mediawiki.org/wiki/Code_of_Conduct).
+The development of this software is covered by a [Code of Conduct](https://www.mediawiki.org/wiki/Special:MyLanguage/Code_of_Conduct).

composer.json

@@ -1,7 +1,7 @@
 {
 	"require-dev": {
 		"jakub-onderka/php-parallel-lint": "1.0.0",
-		"mediawiki/mediawiki-codesniffer": "21.0.0",
+		"mediawiki/mediawiki-codesniffer": "22.0.0",
 		"jakub-onderka/php-console-highlighter": "0.3.2",
 		"mediawiki/minus-x": "0.3.1",
 		"mediawiki/mediawiki-phan-config": "0.3.0"