Merge pull request #1074 from krzyzanowskim/fix/test-on-ubuntu-latest

test on ubuntu latest

.github/workflows/linux.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
 
     steps:
     - name: Checkout