Adjust MAC image runners, older deprecated (#61)

Apple really loves to kill support for older HW/OS versions. :(

Author: earlephilhower

.github/workflows/make-release.yml

@@ -72,7 +72,7 @@ jobs:
     steps:
     - uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: '14.3.1'
+        xcode-version: '15.0.1'
     - uses: actions/checkout@v4
       with:
         submodules: true
@@ -98,11 +98,11 @@ jobs:
         path: aarch64-apple-darwin-mklittlefs-*.zip
 
   build-mac:
-    runs-on: macos-12
+    runs-on: macos-13
     steps:
     - uses: maxim-lobanov/setup-xcode@v1
       with:
-        xcode-version: '13.1.0'
+        xcode-version: '14.1.0'
     - uses: actions/checkout@v4
       with:
         submodules: true