stop using deprecated Duration::milliseconds

src/game/logic.rs

@@ -6,7 +6,11 @@ use serde::Serialize;
 
 /// Utility to construct a `chrono::Duration` from a number of seconds in a constant context.
 const fn seconds(n: i64) -> chrono::Duration {
-    chrono::Duration::milliseconds(n * 1000)
+    match chrono::Duration::try_milliseconds(n * 1000) {
+        Some(duration) => duration,
+        // unwrap/expect not yet const
+        _ => panic!("duration should be in range")
+    }
 }
 
 /// Game constants. This is generic over the maximum number of guesses, to

src/game/routes.rs

@@ -182,7 +182,7 @@ async fn get_clip(
 ) -> Result<(ContentType, Vec<u8>), ApiError> {
     let game = auth.game(&mut tx, id).await?;
     let end = game.time_unlocked();
-    let start = chrono::Duration::milliseconds(seek.unwrap_or(0).into());
+    let start = chrono::Duration::try_milliseconds(seek.unwrap_or(0).into()).expect("clip start time should be in range");
     if start >= end {
         return Err(ApiError::forbidden(
             "cannot seek past end of unlocked music",