Replace #[allow attributes with expect (#7796)

We do have `clippy::allow_attributes` turned on, but it doesn't seem to
work properly

crates/epaint/src/margin.rs

@@ -186,7 +186,7 @@ impl std::ops::Div<f32> for Margin {
 
     #[inline]
     fn div(self, v: f32) -> Self {
-        #![allow(clippy::suspicious_arithmetic_impl)]
+        #![expect(clippy::suspicious_arithmetic_impl)]
         self * v.recip()
     }
 }