Update the supported MacOS version on Apple Silicon

.github/workflows/breakage-against-macos-x86-ponyc-latest.yml

@@ -7,7 +7,7 @@ on:
 jobs:
   vs-ponyc-main-macos:
     name: Verify main against ponyc main on x86-64 macOS
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/[email protected]
       - name: install pony tools

.github/workflows/nightlies.yml

@@ -62,7 +62,7 @@ jobs:
 
   x86-64-apple-darwin-nightly:
     name: Build and upload x86-64-apple-darwin-nightly to Cloudsmith
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/[email protected]
       - name: install pony tools

.github/workflows/pr.yml

@@ -97,7 +97,7 @@ jobs:
 
   x86-64-macos-bootstrap:
     name: x86_64 MacOS bootstrap
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/[email protected]
       - name: Install dependencies
@@ -122,7 +122,7 @@ jobs:
 
   x86-64-macos:
     name: x86-64 MacOS tests
-    runs-on: macos-13
+    runs-on: macos-14
     steps:
       - uses: actions/[email protected]
       - name: install pony tools

.github/workflows/release.yml

@@ -41,7 +41,7 @@ jobs:
 
   x86-64-apple-darwin-release:
     name: Build and upload x86-64-apple-darwin to Cloudsmith
-    runs-on: macos-13
+    runs-on: macos-14
     needs:
       - pre-artefact-creation
     steps:

.release-notes/macos-14.md

@@ -0,0 +1,3 @@
+## Update supported MacOS version for Apple Silicon
+
+We've changed our supported MacOS on Apple Silicon version to 14. All prebuilt binaries are now built on MacOS 14. We will maintain best effort support MacOS 13 for Apple Silicon. All testing is now done using MacOS 14.