Fix case on pgRolesConnectionLimitsQuery

Co-authored-by: Joe Adams <github@joeadams.io> Signed-off-by: Jocelyn Thode <jocelynthode@users.noreply.github.com>

Author: jocelynthode

collector/pg_roles.go

@@ -48,7 +48,7 @@ var (
 []string{"rolname"}, nil,
 )
 
-pgRolesConnectionLimitsQuery = "select pg_roles.rolname,pg_roles.rolconnlimit FROM pg_roles"
+pgRolesConnectionLimitsQuery = "SELECT pg_roles.rolname, pg_roles.rolconnlimit FROM pg_roles"
 )
 
 // Update implements Collector and exposes roles connection limits.