Bump byte-slice-cast from 1.2.0 to 1.2.1 (#359)

Bumps [byte-slice-cast](https://github.com/sdroege/bytes-num-slice-cast) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/sdroege/bytes-num-slice-cast/releases)
- [Changelog](https://github.com/sdroege/byte-slice-cast/blob/master/CHANGELOG.md)
- [Commits](sdroege/byte-slice-cast@1.2.0...1.2.1)

---
updated-dependencies:
- dependency-name: byte-slice-cast
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -15,7 +15,7 @@ serde = { version = "1.0.139", optional = true }
 parity-scale-codec-derive = { path = "derive", version = "3.1.3", default-features = false, optional = true }
 bitvec = { version = "1", default-features = false, features = [ "alloc" ], optional = true }
 bytes = { version = "1", default-features = false, optional = true }
-byte-slice-cast = { version = "1.0.0", default-features = false }
+byte-slice-cast = { version = "1.2.1", default-features = false }
 generic-array = { version = "0.14.4", optional = true }
 arbitrary = { version = "1.0.1", features = ["derive"], optional = true }
 impl-trait-for-tuples = "0.2.2"