Run macOS tests on latest version that is x86-64

GitHub has bumped the runner `macos-latest` to mean `macos-14`. This
runner is only available as ARM64.

.github/workflows/ci.yml

@@ -42,15 +42,15 @@ jobs:
             # /home is symlinked to /usr/home. pwd will return the resolved path.
             work_directory: /usr/home/runner/work/action/action
 
-          - name: macos-latest
+          - name: macos-13
             work_directory: /Users/runner/work/action/action
 
         exclude:
           - version: '12.2'
             architecture: { name: arm64 }
 
           - architecture: { name: arm64 }
-            host: { name: macos-latest }
+            host: { name: macos-13 }
 
         include:
           - version: '14.0'
@@ -72,7 +72,7 @@ jobs:
               name: x86-64
               uname: amd64
             host:
-              name: macos-latest
+              name: macos-13
               work_directory: /Users/runner/work/action/action
 
     steps:
@@ -116,15 +116,15 @@ jobs:
           - name: ubuntu-latest
             work_directory: /home/runner/work/action/action
 
-          - name: macos-latest
+          - name: macos-13
             work_directory: /Users/runner/work/action/action
 
         exclude:
           - version: '6.8'
             architecture: { name: arm64 }
 
           - architecture: { name: arm64 }
-            host: { name: macos-latest }
+            host: { name: macos-13 }
 
     steps:
       - name: Checkout
@@ -165,7 +165,7 @@ jobs:
           - name: ubuntu-latest
             work_directory: /home/runner/work/action/action
 
-          - name: macos-latest
+          - name: macos-13
             work_directory: /Users/runner/work/action/action
 
         exclude:
@@ -179,7 +179,7 @@ jobs:
             architecture: { name: arm64 }
 
           - architecture: { name: arm64 }
-            host: { name: macos-latest }
+            host: { name: macos-13 }
 
     steps:
       - name: Checkout
@@ -242,7 +242,7 @@ jobs:
   test-hypervisor-config:
     timeout-minutes: 5
     name: Test configuring hypervisor
-    runs-on: macos-latest
+    runs-on: macos-13
 
     steps:
       - name: Checkout
@@ -266,7 +266,7 @@ jobs:
   test-custom-vm-image:
     timeout-minutes: 5
     name: Test custom VM image
-    runs-on: macos-latest
+    runs-on: macos-13
 
     steps:
       - name: Checkout
@@ -401,7 +401,7 @@ jobs:
   multiple-steps:
     timeout-minutes: 5
     name: Test running the action multiple times
-    runs-on: macos-latest
+    runs-on: macos-13
 
     strategy:
       fail-fast: false
@@ -443,7 +443,7 @@ jobs:
   openbsd-qemu-macos:
     timeout-minutes: 5
     name: Test OpenBSD with QEMU on macOS runner
-    runs-on: macos-latest
+    runs-on: macos-13
 
     steps:
       - name: Checkout