Use latest ubuntu for CI

Author: warmwaffles

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     name: Lint
     strategy:
       matrix:
-        os: ["ubuntu-20.04"]
+        os: ["ubuntu-latest"]
         elixir: ["1.17"]
         otp: ["27"]
     steps:
@@ -40,7 +40,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: ["ubuntu-20.04"]
+        os: ["ubuntu-latest"]
         elixir: ["1.17", "1.16", "1.15", "1.14"]
         otp: ["27", "26", "25", "24"]
         exclude: