Update core_codestyle.yml

Workflow Changes pt2. Based on the work of @Meltie2013 for MangosThree
* Fix workflow compiler and default it to clang for now on

.github/workflows/core_codestyle.yml

@@ -4,13 +4,13 @@ on:
       branches: [ master ]
   pull_request:
       branches: [ master ]
-  
+
 jobs:
   check-codestyle:
     strategy:
       fail-fast: false
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Check Codestyling
     steps:
       - uses: actions/checkout@v2