fix clippy

src/index.rs

@@ -1693,11 +1693,11 @@ impl Index {
 
  let rune_id_to_rune_entry = rtx.open_table(RUNE_ID_TO_RUNE_ENTRY)?;
  let id_min = RuneId {
- block: block_height,
+ block: u64::from(block_height),
  tx: 0,
  };
  let id_max = RuneId {
- block: block_height + 1,
+ block: u64::from(block_height + 1),
  tx: 0,
  };