fix: use infallible .into() instead of .try_into() for ValidityWindow conversion

Clippy flagged unnecessary fallible conversion since RangeFrom<u64> to
ValidityWindow<u64> cannot fail.

nssa/core/src/circuit_io.rs

@@ -103,7 +103,7 @@ mod tests {
                 ),
                 [0xab; 32],
             )],
-            block_validity_window: (1..).try_into(),
+            block_validity_window: (1..).into(),
             timestamp_validity_window: TimestampValidityWindow::new_unbounded(),
         };
         let bytes = output.to_bytes();