Bump sha2 from 0.9.6 to 0.9.8

Bumps [sha2](https://github.com/RustCrypto/hashes) from 0.9.6 to 0.9.8.
- [Release notes](https://github.com/RustCrypto/hashes/releases)
- [Commits](https://github.com/RustCrypto/hashes/compare/sha2-v0.9.6...sha2-v0.9.8)

---
updated-dependencies:
- dependency-name: sha2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.lock

@@ -1524,9 +1524,9 @@ dependencies = [
 
 [[package]]
 name = "sha2"
-version = "0.9.6"
+version = "0.9.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9204c41a1597a8c5af23c82d1c921cb01ec0a4c59e07a9c7306062829a3903f3"
+checksum = "b69f9a4c9740d74c5baa3fd2e547f9525fa8088a8a958e0ca2409a514e33f5fa"
 dependencies = [
  "block-buffer",
  "cfg-if 1.0.0",

Cargo.toml

@@ -16,7 +16,7 @@ log = "0.4.14"
 simplelog = "0.10.0"
 toml = "0.5.8"
 digest = "0.9.0"
-sha2 = "0.9.6"
+sha2 = "0.9.8"
 ed25519-dalek = "1.0.1"
 x25519-dalek = "1.1.1"
 ecies-ed25519 = "0.5.1"