fix: use ubuntu-latest as ci runner (#33)

Author: UlisesGascon

.github/workflows/ci.yml

@@ -9,7 +9,7 @@ permissions:
 
 jobs:
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     permissions:
       contents: read  # for actions/checkout to fetch code
       checks: write  # for coverallsapp/github-action to create new checks
@@ -220,4 +220,4 @@ jobs:
       with:
         github-token: ${{ secrets.github_token }}
         parallel-finished: true
-        
+