Update from upstream SpigotMC

Fix Corrupted Trapped Chests SpigotMC/Spigot@08de30ca3e
Don't time async events SpigotMC/Spigot@c3a9e71da3

Bukkit-Patches/0002-Spigot-Timings.patch

@@ -272,9 +272,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
                          if (!eventClass.isAssignableFrom(event.getClass())) {
                              return;
                          }
-+                        timings.startTiming(); // Spigot
++                        // Spigot start
++                        boolean isAsync = event.isAsynchronous();
++                        if (!isAsync) timings.startTiming();
                          method.invoke(listener, event);
-+                        timings.stopTiming(); // Spigot
++                        if (!isAsync) timings.stopTiming();
++                        // Spigot end
                      } catch (InvocationTargetException ex) {
                          throw new EventException(ex.getCause());
                      } catch (Throwable t) {