Address latest clippy warnings

Clippy believes the sealed trait is unused. Although it's never
referenced, it's implemented on public types. That must not be enough of
a use for the newest clippy.

logging/src/usbd.rs

@@ -243,6 +243,12 @@ pub struct UsbdConfigBuilder {
     cfg: UsbdConfig,
 }
 
+impl Default for UsbdConfigBuilder {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
 impl UsbdConfigBuilder {
     /// Create a new builder with the default values.
     pub const fn new() -> Self {

src/common/pit.rs

@@ -94,6 +94,7 @@ pub fn new<const N: u8>(pit: crate::ral::pit::Instance<N>) -> Channels {
 }
 
 mod private {
+    #[allow(dead_code)]
     pub trait Sealed {}
 }
 /// Describes a valid PIT channel.