Update sha2 to latest

Author: ehuss

Cargo.lock

@@ -35,7 +35,7 @@ pulldown-cmark = { version = "0.10.0", default-features = false, features = ["ht
 regex = "1.8.1"
 serde = { version = "1.0.163", features = ["derive"] }
 serde_json = "1.0.96"
-sha2 = "0.9"
+sha2 = "0.10.8"
 shlex = "1.3.0"
 tempfile = "3.4.0"
 toml = "0.5.11" # Do not update, see https://github.com/rust-lang/mdBook/issues/2037