Deprecate Ubuntu 20.04 (#3493)

Author: a-b

.github/workflows/release-build-sign-upload.yml

@@ -910,9 +910,8 @@ jobs:
         image:
         - debian:11
         - debian:12
-        - ubuntu:20.04
         - ubuntu:22.04
-        - ubuntu
+        - ubuntu:latest
     runs-on: ubuntu-latest
     steps:
 

.github/workflows/release-update-repos.yml

@@ -311,7 +311,7 @@ jobs:
         - debian:11
         - debian:12
         - ubuntu:22.04
-        - ubuntu
+        - ubuntu:latest
     runs-on: ubuntu-latest
     needs:
     - setup

.github/workflows/tests-unit.yml

@@ -34,7 +34,7 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-          - ubuntu-20.04
+          - ubuntu-22.04
           - macos-latest
           - macos-13
           - windows-latest