Merge branch '5.4' into 6.0

* 5.4:
  [Workflow] Fix deprecated syntax for interpolated strings

Author: nicolas-grekas

Dumper/PlantUmlDumper.php

@@ -103,16 +103,16 @@ public function dump(Definition $definition, Marking $marking = null, array $opt
                         }
 
                         $lines = [
-                            "$fromEscaped -${transitionColor}-> ${transitionEscaped}${transitionLabel}",
-                            "$transitionEscaped -${transitionColor}-> ${toEscaped}${transitionLabel}",
+                            "{$fromEscaped} -{$transitionColor}-> {$transitionEscaped}{$transitionLabel}",
+                            "{$transitionEscaped} -{$transitionColor}-> {$toEscaped}{$transitionLabel}",
                         ];
                         foreach ($lines as $line) {
                             if (!\in_array($line, $code)) {
                                 $code[] = $line;
                             }
                         }
                     } else {
-                        $code[] = "$fromEscaped -${transitionColor}-> $toEscaped: $transitionEscapedWithStyle";
+                        $code[] = "{$fromEscaped} -{$transitionColor}-> {$toEscaped}: {$transitionEscapedWithStyle}";
                     }
                 }
             }