RustSetupSteps.yml: Update to latest cargo_tarpaulin 31.2 and Rust To…

…olchain (#363)

Update to the latest version of cargo_tarpaulin, release 31.2. This
change is required to allow tarpaulin to function with Rust toolchain
1.80. Running tarpaulin 27.3 with toolchain 1.80 results in the tool
failing with a "Parse error".

.sync/Version.njk

@@ -44,4 +44,4 @@
 
 {# Rust tool versions. #}
 {% set cargo_make = "0.37.9" %}
-{% set cargo_tarpaulin = "0.27.3" %}
+{% set cargo_tarpaulin = "0.31.2" %}