fix: Upgrade Ubuntu runners to 22.04 as 20.04 is EOL

It will be removed on April 1st and brownout will happen in March.

Author: Geod24

.github/workflows/main.yml

@@ -52,7 +52,7 @@ jobs:
       fail-fast: false
       matrix:
         # Latest stable version, update at will
-        os: [ macOS-13, ubuntu-20.04, windows-2019 ]
+        os: [ macOS-13, ubuntu-22.04, windows-2019 ]
         dc:
           # Always test latest as that is what we use to compile on release
           - dmd-latest

.github/workflows/release.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macOS-13, ubuntu-20.04, windows-2019 ]
+        os: [ macOS-13, ubuntu-22.04, windows-2019 ]
         arch: [ x86_64 ]
         include:
           - { os: windows-2019, arch: i686 }