update some outdated dependencies

satrs/Cargo.toml

@@ -51,7 +51,7 @@ version = "0.8"
 optional = true
 
 [dependencies.downcast-rs]
-version = "1.2"
+version = "2"
 default-features = false
 optional = true
 
@@ -92,7 +92,7 @@ serde = "1"
 zerocopy = "0.8"
 once_cell = "1"
 serde_json = "1"
-rand = "0.8"
+rand = "0.9"
 tempfile = "3"
 
 [dev-dependencies.postcard]
@@ -104,7 +104,6 @@ std = [
     "downcast-rs/std",
     "alloc",
     "bus",
-    "postcard/use-std",
     "crossbeam-channel/std",
     "serde/std",
     "spacepackets/std",