build: Upgrade phan-taint-check-plugin from 1.5.x to 2.0.1

Change-Id: I08d38872db05669aa6200fefb410d144fccf2427

composer.json

@@ -18,6 +18,6 @@
 		]
 	},
 	"extra": {
-		"phan-taint-check-plugin": "1.5.0"
+		"phan-taint-check-plugin": "2.0.1"
 	}
 }

src/SpecialMathShowImage.php

@@ -119,16 +119,15 @@ class SpecialMathShowImage extends SpecialPage {
 
 	/**
 	 * Prints the specified error message as svg.
-	 * @param string $msg error message
+	 * @param string $msg error message, HTML escaped
 	 * @return string xml svg image with the error message
 	 */
 	private function printSvgError( $msg ) {
 		global $wgDebugComments;
-		$escaped = htmlspecialchars( $msg );
 		$result = <<<SVG
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 4" preserveAspectRatio="xMidYMid meet" >
 <text text-anchor="start" fill="red" y="2">
-$escaped
+$msg
 </text>
 </svg>
 SVG;