run rustfmt on latest

Author: Lutetium-Vanadium

.github/workflows/default.yml

@@ -73,7 +73,7 @@ jobs:
 
   rustfmt:
     name: rustfmt
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
     steps:
       - name: checkout_repository
         uses: actions/checkout@v1