fix: MathF.Clamp → float.Clamp in ParticleSpewer (MathF has no Clamp method)

Agent-Logs-Url: https://github.com/winnerspiros/osu/sessions/850e952a-f9d0-41e8-8029-923e55c58bcf

Co-authored-by: winnerspiros <1675249+winnerspiros@users.noreply.github.com>

Author: Copilot

osu.Game/Graphics/ParticleSpewer.cs

@@ -241,7 +241,7 @@ public Vector2 PositionAtTime(float timeSinceStart, float gravity, float maxDura
                 return StartPosition + (Velocity + currentGravity) * timeSinceStart / maxDuration;
             }
 
-            private float progressAtTime(float timeSinceStart) => MathF.Clamp(timeSinceStart / Duration, 0, 1);
+            private float progressAtTime(float timeSinceStart) => float.Clamp(timeSinceStart / Duration, 0, 1);
         }
     }
 }