fix: update version in Cargo.toml to 0.7.0

Updated the version in Cargo.toml from workspace to 0.7.0 to ensure
proper versioning and dependency management.

Author: romen

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "aurora"
-version.workspace = true
+version = "0.7.0"
 edition = "2021"
 
 [lib]
@@ -23,4 +23,4 @@ libcrux-kem = "0.0.2-alpha.3"
 rand = "0.8"
 anyhow = "1.0"
 kem = "0.3.0-pre.0"
-rand_core = "0.6.4"
+rand_core = "0.6.4"