update ubuntu version in ci action

Author: AlePouroullis

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ name: ci
 on: [push]
 jobs:
   compile:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.9", "3.10", "3.11"]
@@ -22,7 +22,7 @@ jobs:
       - name: Compile
         run: poetry run mypy .
   test:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         python-version: ["3.9", "3.10", "3.11"]
@@ -52,7 +52,7 @@ jobs:
   publish:
     needs: [compile, test]
     if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
       - name: Checkout repo
         uses: actions/checkout@v3