chore: Remove unused base16 dependency

Noticed this dependency was unused.

The `encode_base16` function was a bit useless too, as you can do this
with `format!()`, not requiring a third party dependency. Parsing base16
could make sense for this as a dependency, but we're not doing that.

crates/turbo-tasks-hash/src/lib.rs

@@ -4,14 +4,12 @@
 //! invalidation, and encoding the hash to an hexadecimal string for use in a
 //! file name.
 
-mod base16;
 mod deterministic_hash;
 mod hex;
 mod md4;
 mod xxh3_hash64;
 
 pub use crate::{
-    base16::encode_base16,
     deterministic_hash::{DeterministicHash, DeterministicHasher},
     hex::{encode_hex, encode_hex_string},
     md4::hash_md4,

deny.toml

@@ -17,7 +17,7 @@ allow = [
   "MPL-2.0-no-copyleft-exception",
   # enum-iterator*
   "0BSD",
-  # base16, notify
+  # notify
   "CC0-1.0",
   # Inflector, hyper-tungstenite
   "BSD-2-Clause",