use Ubuntu latest

Author: ildyria

.github/workflows/CI.yml

@@ -6,7 +6,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Build
     steps:
       # Checks out a copy of your repository on the ubuntu machine

.github/workflows/Docker.yml

@@ -12,7 +12,7 @@ env:
 
 jobs:
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Build
     steps:
       # Checks out a copy of your repository on the ubuntu machine