fix(plugins/gcpaudit_rs): Fix our JSON object key order

Signed-off-by: Gerald Combs <gerald@wireshark.org>

Author: geraldcombs

plugins/gcpaudit_rs/Cargo.lock

@@ -15,7 +15,7 @@ falco_event = "0.5.1"
 falco_plugin = "0.5.1"
 anyhow = "1"
 serde = "1"
-serde_json = "1"
+serde_json = { version = "1", features = ["preserve_order"] }
 serde_spanned = "1"
 schemars = "1"
 google-cloud-pubsub = "0.30.0"