virtio-devices: reevaluate #[allow] attributes

Convert the still-needed #[allow]s to #[expect] so they warn if the
lints stop firing.

Part of #8326.

Signed-off-by: Tushar Khatri <hello@tusharkhatri.in>

virtio-devices/src/block.rs

@@ -737,7 +737,7 @@ pub struct BlockState {
 
 impl Block {
     /// Create a new virtio block device that operates on the given file.
-    #[allow(clippy::too_many_arguments)]
+    #[expect(clippy::too_many_arguments)]
     pub fn new(
         id: String,
         disk_image: Box<dyn AsyncFullDiskFile>,