Provisionally pinning rustc ersion pre 1.81 sorting changes

Author: Rupert MacAllegro

.github/actions/build_env/action.yaml

@@ -27,7 +27,8 @@ runs:
     - uses: actions-rs/toolchain@v1
       with:
         profile: minimal
-        toolchain: 1.83.0
+        # Provisionally pinning version pre 1.81 sorting changes
+        toolchain: 1.80.1
         override: true
 
     - name: install rustfmt clippy