fix: deprecated s.o base image for github workflows

Author: Adriano Santos

.github/workflows/ci.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Check format
         run: mix format --check-formatted
   tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
     strategy:
       matrix:
@@ -56,7 +56,7 @@ jobs:
       - name: Run Tests
         run: mix test
   interop-tests:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Interop tests
     needs: check_format
     if: ${{ github.ref != 'refs/heads/master' }}
@@ -80,7 +80,7 @@ jobs:
         working-directory: ./interop
 
   interop-tests-all:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Interop tests OTP ${{matrix.otp}} / Elixir ${{matrix.elixir}}
     needs: check_format
     if: ${{ github.ref == 'refs/heads/master' }}
@@ -111,7 +111,7 @@ jobs:
         working-directory: ./interop
 
   check_release:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     name: Check release
     needs: check_format
     steps: