chore: rename fn_args_layout to fn_params_layout in rustfmt.toml (

#994)

Since rust-lang/rustfmt#4149 is released with
latest rust toolchain 1.69, we are seeing some warnings from rustfmt.
This PR addresses the depreciation note coming from rustfmt.toml.

rustfmt.toml

@@ -1,4 +1,4 @@
-fn_args_layout = "Tall"
+fn_params_layout = "Tall"
 hard_tabs = false
 match_arm_leading_pipes = "Never"
 max_width = 100