fix: Update CI runner to ubuntu-latest

Author: coreyti

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   all:
     name: Build & Test
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     env:
       MIX_ENV: test
       PLAYWRIGHT_TRANSPORT: driver