Use GitHub's M1 macOS runner

An M1 (aarch64, Apple Silicon) runner is available on the free plan
since January 2024 (see
https://github.blog/changelog/2024-01-30-github-actions-introducing-the-new-m1-macos-runner-available-to-open-source/).

.github/workflows/kani.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [macos-13, ubuntu-20.04, ubuntu-22.04]
+        os: [macos-13, ubuntu-20.04, ubuntu-22.04, macos-14]
     steps:
       - name: Checkout Kani
         uses: actions/checkout@v4

.github/workflows/release.yml

@@ -44,6 +44,32 @@ jobs:
           os: macos-13
           arch: x86_64-apple-darwin
 
+  build_bundle_macos_aarch64:
+    name: BuildBundle-MacOs-ARM
+    runs-on: macos-14
+    permissions:
+      contents: write
+    outputs:
+      version: ${{ steps.bundle.outputs.version }}
+      bundle: ${{ steps.bundle.outputs.bundle }}
+      package: ${{ steps.bundle.outputs.package }}
+      crate_version: ${{ steps.bundle.outputs.crate_version }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup Kani Dependencies
+        uses: ./.github/actions/setup
+        with:
+          os: macos-14
+
+      - name: Build bundle
+        id: bundle
+        uses: ./.github/actions/build-bundle
+        with:
+          os: macos-14
+          arch: aarch64-apple-darwin
+
   build_bundle_linux:
     name: BuildBundle-Linux
     runs-on: ubuntu-20.04