feat(rust): add up to version 1.70 options (#579)

src/rust/devcontainer-feature.json

 {
     "id": "rust",
-    "version": "1.0.11",
+    "version": "1.0.12",
     "name": "Rust",
     "documentationURL": "https://github.com/devcontainers/features/tree/main/src/rust",
     "description": "Installs Rust, common Rust utilities, and their required dependencies",
@@ -10,6 +10,13 @@
             "proposals": [
                 "latest",
                 "none",
+                "1.70",
+                "1.69",
+                "1.68",
+                "1.67",
+                "1.66",
+                "1.65",
+                "1.64",
                 "1.63",
                 "1.62",
                 "1.61"