refactor(tvix/store): bump fastcdc dep

This removes the use of Box::new, switching fastcdc to version 3.0.2
with https://github.com/nlfiedler/fastcdc-rs/issues/25 fixed.

Change-Id: I64f388b9e0a7f358e25a8bb7ca0e4df1d3bb01c4
Reviewed-on: https://cl.tvl.fyi/c/depot/+/8249
Tested-by: BuildkiteCI
Reviewed-by: raitobezarius <tvl@lahfa.xyz>
Reviewed-by: tazjin <tazjin@tvl.su>
Autosubmit: flokli <flokli@flokli.de>

tvix/store/src/import.rs

@@ -129,7 +129,7 @@ fn process_entry<BS: BlobService, CS: ChunkService + std::marker::Sync, DS: Dire
             let chunker_max_size = chunker_avg_size * 4;
 
             let chunker = fastcdc::v2020::StreamCDC::new(
-                Box::new(file),
+                file,
                 chunker_min_size,
                 chunker_avg_size,
                 chunker_max_size,