chore(deps): bump getrandom to 0.4 in qbz-cast

getrandom::getrandom() was renamed to getrandom::fill() in 0.3; adopt fill() at the cast token call site. Consolidates onto the getrandom 0.4.2 that tempfile and rand already pull in.

cc

crates/qbz-cast/Cargo.toml

@@ -35,7 +35,7 @@ thiserror = "2"
 log = "0.4"
 
 # CSPRNG for cast media path tokens (not RandomState hash)
-getrandom = "0.2"
+getrandom = "0.4"
 
 # Async runtime (for DLNA)
 tokio = { version = "1", features = ["rt", "sync"] }