Use normal severity for Phan checks

Signed-off-by: Morris Jobke <hey@morrisjobke.de>

Author: MorrisJobke

build/.phan/config.php

@@ -155,7 +155,7 @@
 	// Issue::SEVERITY_CRITICAL. Setting it to only
 	// critical issues is a good place to start on a big
 	// sloppy mature code base.
-	'minimum_severity' => \Phan\Issue::SEVERITY_CRITICAL,
+	'minimum_severity' => \Phan\Issue::NORMAL_CRITICAL,
 
 	// If true, missing properties will be created when
 	// they are first seen. If false, we'll report an