feat(msrv): Set new MSRV after dep upgrades

BREAKING CHANGE: The MSRV has been increased to 1.57.0

Cargo.toml

@@ -8,19 +8,20 @@ license = "Apache-2.0"
 repository = "https://github.com/zkat/ssri-rs"
 homepage = "https://github.com/zkat/ssri-rs"
 readme = "README.md"
+rust-version = "1.57.0"
 
 [dependencies]
-sha2 = "0.10.6"
 base64 = "0.21.0"
 digest = "0.10.6"
-sha-1 = "0.10.1"
 hex = "0.4.3"
 serde = { version = "1.0.152", optional = true }
+sha-1 = "0.10.1"
+sha2 = "0.10.6"
 thiserror = "1.0.38"
 
 [features]
 default = ["serde"]
 
 [dev-dependencies]
-serde_json = "1.0.93"
 serde_derive = "1.0.152"
+serde_json = "1.0.93"