chore: use ubuntu-latest in ci

ubuntu-20.04 is obsolete on GH Actions

Author: soedirgo

.github/workflows/release.yml

@@ -34,7 +34,7 @@ jobs:
           - supautils
         postgres: [13, 14, 15, 16, 17]
         box:
-          - { runner: ubuntu-20.04, arch: amd64 }
+          - { runner: ubuntu-latest, arch: amd64 }
           - { runner: arm-runner, arch: arm64 }
     runs-on: ${{ matrix.box.runner }}
     steps: