Increase diff pixels

sparse_strips/vello_sparse_tests/tests/basic.rs

diff --git a/sparse_strips/vello_sparse_tests/tests/basic.rs b/sparse_strips/vello_sparse_tests/tests/basic.rs
index 24aa330..4ce25e1 100644
--- a/sparse_strips/vello_sparse_tests/tests/basic.rs
+++ b/sparse_strips/vello_sparse_tests/tests/basic.rs
@@ -415,7 +415,7 @@
     ctx.pop_layer();
 }
 
-#[vello_test]
+#[vello_test(diff_pixels = 1)]
 fn stroke_scaled(ctx: &mut impl Renderer) {
     let mut path = BezPath::new();
     path.move_to((0.0, 0.0));