Enable editions support for rust

PiperOrigin-RevId: 571956899

src/google/protobuf/compiler/rust/generator.h

@@ -34,7 +34,7 @@ class PROTOC_EXPORT RustGenerator final
                 std::string* error) const override;
 
   uint64_t GetSupportedFeatures() const override {
-    return FEATURE_PROTO3_OPTIONAL;
+    return FEATURE_PROTO3_OPTIONAL | FEATURE_SUPPORTS_EDITIONS;
   }
 };