perf(cli): use faster_hex (#22761)

`cli::util::checksum` was showing up on flame graphs because it was
concatenating allocated strings. We can use `faster-hex` to improve it.

1 files changed, 1 insertions, 1 deletions

diff --git a/cli/tools/registry/mod.rs b/cli/tools/registry/mod.rs
index 7b940592f..faea95a1a 100644
--- a/cli/tools/registry/mod.rs
+++ b/cli/tools/registry/mod.rs
@@ -688,7 +688,7 @@ async fn publish_package(
         package.scope, package.package, package.version
       ),
       digest: provenance::SubjectDigest {
-        sha256: hex::encode(sha2::Sha256::digest(&meta_bytes)),
+        sha256: faster_hex::hex_string(&sha2::Sha256::digest(&meta_bytes)),
       },
     };
     let bundle = provenance::generate_provenance(subject).await?;