Revert 66584fd's serde & serde_json bump

Author: jbourassa

shopify_function/Cargo.toml

@@ -7,9 +7,9 @@ license = "MIT"
 description = "Crate to write Shopify Functions in Rust."
 
 [dependencies]
-serde = { version = "1.0.197", features = ["derive"] }
-serde_json = "1.0.114"
 shopify_function_macro = { version = "0.5.0", path = "../shopify_function_macro" }
+serde = { version = "1.0.13", features = ["derive"] }
+serde_json = "1.0"
 
 [dev-dependencies]
 graphql_client = "0.13.0"