feat: use sets etc.

rust/src/model/rainy.rs

@@ -1,3 +1,4 @@
+use std::collections::BTreeSet;
 use serde::Deserialize;
 use crate::pkg::PkgKeyVersion;
 
@@ -19,6 +20,6 @@ pub struct V1Version {
     pub description: String,
     pub version_number: String,
     pub icon: String,
-    pub dependencies: Vec<PkgKeyVersion>,
+    pub dependencies: BTreeSet<PkgKeyVersion>,
     pub download_url: String,
 }