chore: Upgrade zstd 0.12.3 to 0.13.3 (#11936)

## Summary

- Upgrades `zstd` crate from 0.12.3 to 0.13.3 in `turborepo-cache`,
picking up zstd 1.5.7 (from 1.5.2) which includes ~20% faster
compression.
- `zstd-safe` also drops its direct `libc` dependency in this range,
slightly simplifying the dependency tree.

Author: anthonyshew

Cargo.lock

@@ -49,4 +49,4 @@ turbopath = { workspace = true }
 turborepo-analytics = { workspace = true }
 turborepo-api-client = { workspace = true }
 turborepo-auth = { workspace = true }
-zstd = "0.12.3"
+zstd = "0.13.3"