Fix debug message for artifact endpoint (#1449)

lemonldap-ng-portal/lib/Lemonldap/NG/Portal/Issuer/SAML.pm

@@ -955,8 +955,9 @@ sub run {
 
 sub artifactServer {
     my ( $self, $req ) = @_;
-    $self->logger->debug(
-        "URL $req->uri detected as an artifact resolution service URL");
+    $self->logger->debug( "URL "
+          . $req->uri
+          . " detected as an artifact resolution service URL" );
 
     # Artifact request are sent with SOAP trough POST
     my $art_request = $req->content;