disable std by default for downcast

fsrc-core/Cargo.toml

@@ -9,14 +9,13 @@ edition = "2021"
 thiserror = "1.0"
 bus = "2.2.3"
 num = "0.4"
-downcast-rs = { version = "1.2.0" }
 
 [dependencies.spacepackets]
 path = "../spacepackets"
 
-#[dependencies.downcast-rs]
-#version = "1.2.0"
-#default-features = false
+[dependencies.downcast-rs]
+version = "1.2.0"
+default-features = false
 
 [dev-dependencies]
 postcard = { version = "1.0.1", features = ["use-std"] }