release twenty-first v0.42.0-alpha.9

✨ Features

- Implement `{Lower, Upper}Hex` for `Digest` (65dc94d)

⚙️ Miscellaneous

- *(Makefile)* Use `nextest` for better timing results (638b0ae)
- Canonicalize `use` statements (920c5db)

♻️ Refactor

- (!) Remove generic from `MerkleTree` (aa340ff)

✅ Testing

- *(mmra_with_mps)* Replace slow sanity checks with a test (eac5e7a)
- Reduce test runtimes for slow tests (cbdaede)

twenty-first/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "twenty-first"
-version = "0.42.0-alpha.8"
+version = "0.42.0-alpha.9"
 authors = ["Triton Software AG"]
 edition = "2021"