fix: use 'new' instead of 'override' for RulesetShaderManager.Load() (CS0506)

Author: Copilot

osu.Game/Rulesets/UI/DrawableRulesetDependencies.cs

@@ -209,7 +209,7 @@ public RulesetShaderManager(IRenderer renderer, NamespacedResourceStore<byte[]>
                 this.parent = parent;
             }
 
-            public override IShader Load(string vertex, string fragment)
+            public new IShader Load(string vertex, string fragment)
             {
                 try
                 {