Rust toolchain: Update to 1.84 (#415)

Update to Rust toolchain 1.84.

Author: antklein

.sync/Version.njk

@@ -43,7 +43,7 @@
 {% set python_version = "3.12" %}
 
 {# The Rust toolchain version to use. #}
-{% set rust_toolchain = "1.80.0" %}
+{% set rust_toolchain = "1.84.0" %}
 
 {# Rust tool versions. #}
 {% set cargo_make = "0.37.24" %}