chore: remove udb as a dependency of envoy-client

Author: NathanFlurry

engine/packages/util-serde/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "rivet-util-serde"
+version.workspace = true
+authors.workspace = true
+license.workspace = true
+edition.workspace = true
+
+[dependencies]
+indexmap.workspace = true
+serde.workspace = true
+serde_json.workspace = true
+thiserror.workspace = true