build: bump version to 0.3.0

Update package version in Cargo.toml and Cargo.lock to reflect a new release.

Cargo.lock

@@ -392,7 +392,7 @@ dependencies = [
 
 [[package]]
 name = "sqm-autorate-rust"
-version = "0.2.0"
+version = "0.3.0"
 dependencies = [
  "anyhow",
  "fastrand",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sqm-autorate-rust"
-version = "0.2.0"
+version = "0.3.0"
 edition = "2024"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html