Bug 493027: Update the comment in DB::Pg::sql_string_concat()

Bugzilla/DB/Pg.pm

@@ -188,9 +188,8 @@ sub sql_date_math {
 sub sql_string_concat {
     my ($self, @params) = @_;
 
-    # Postgres 7.3 does not support concatenating of different types, so we
-    # need to cast both parameters to text. Version 7.4 seems to handle this
-    # properly, so when we stop support 7.3, this can be removed.
+    # PostgreSQL 8.3 and newer require an explicit coercion to text
+    # to support concatenation of different data types.
     return '(CAST(' . join(' AS text) || CAST(', @params) . ' AS text))';
 }