Fix rebase change

vello/src/wgpu_engine.rs

diff --git a/vello/src/wgpu_engine.rs b/vello/src/wgpu_engine.rs
index 1c13e7f..42ab919 100644
--- a/vello/src/wgpu_engine.rs
+++ b/vello/src/wgpu_engine.rs
@@ -355,6 +355,7 @@
             depth_stencil: None,
             multisample: wgpu::MultisampleState::default(),
             multiview: None,
+            cache: None,
         });
         let id = self.shaders.len();
         self.shaders.push(Shader {