Switch from removed macos-11 runners to macos-latest with Xcode 16.1

The `macos-11` runners are no longer hosted by GitHub as this OS version
is too old.  Likewise Xcode 13.2.1 is no longer available, the lowest
supported version appears to be `15.0`.

.github/workflows/sdk.yml

@@ -30,25 +30,25 @@ jobs:
         TAG: ${{ github.event.release.tag_name }}
 
   macos:
-    runs-on: macos-11
+    runs-on: macos-latest
     steps:
     - run: ls /Applications/Xcode*
     - run: cp -R $SDK_PATH .
       env:
-        SDK_PATH: /Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
+        SDK_PATH: /Applications/Xcode_16.1.0.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
     - run: gtar --zstd -cf MacOSX.sdk.tar.zst MacOSX.sdk
     - run: gh release upload $TAG MacOSX.sdk.tar.zst -R ${{ github.repository }}
       env:
         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         TAG: ${{ github.event.release.tag_name }}
 
   ios:
-    runs-on: macos-11
+    runs-on: macos-latest
     steps:
     - run: ls /Applications/Xcode*
     - run: cp -R $SDK_PATH .
       env:
-        SDK_PATH: /Applications/Xcode_13.2.1.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
+        SDK_PATH: /Applications/Xcode_16.1.0.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk
     - run: gtar --zstd -cf iPhoneOS.sdk.tar.zst iPhoneOS.sdk
     - run: gh release upload $TAG iPhoneOS.sdk.tar.zst -R ${{ github.repository }}
       env: