Fix Clippy

Author: stanislav-tkach

rust/cardano-blockchain-types/src/multi_era_block_data.rs

@@ -294,6 +294,7 @@ impl MultiEraBlock {
     }
 
     /// Returns a slot of the block.
+    #[must_use]
     pub fn slot(&self) -> Slot {
         self.decode().slot().into()
     }