Upgrade CI configuration following macOS-11 deprecation

macOS-11 is going away at the end of June.
As a consequence, we upgrade to macOS-12, upgrade the supported
frontend versions, and add some arm64 tests to prepare for
future upgrades.

.github/workflows/main.yml

@@ -52,7 +52,7 @@ jobs:
       fail-fast: false
       matrix:
         # Latest stable version, update at will
-        os: [ macOS-11, ubuntu-20.04, windows-2019 ]
+        os: [ macOS-12, ubuntu-20.04, windows-2019 ]
         dc:
           # Always test latest as that is what we use to compile on release
           - dmd-latest
@@ -62,15 +62,17 @@ jobs:
           - ldc-master
           # Test some intermediate versions
           - ldc-1.26.0
-          - dmd-2.098.1
-          - dmd-2.101.1
-          - dmd-2.104.2
+          - dmd-2.099.1
+          - dmd-2.102.2
+          - dmd-2.105.3
         include:
           - { do_test: false }
           - { dc: dmd-latest, do_test: true }
           - { dc: ldc-latest, do_test: true }
           - { dc: dmd-master, do_test: true }
           - { dc: ldc-master, do_test: true }
+          # Test on ARM64
+          - { os: macOS-14, dc: ldc-latest, do_test: true }
 
     runs-on: ${{ matrix.os }}
     steps:

.github/workflows/release.yml

@@ -14,10 +14,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ macOS-11, ubuntu-20.04, windows-2019 ]
+        os: [ macOS-12, ubuntu-20.04, windows-2019 ]
         arch: [ x86_64 ]
         include:
           - { os: windows-2019, arch: i686 }
+          - { os: macOS-latest, arch: arm64 }
 
     runs-on: ${{ matrix.os }}
     steps: