fixing unit tests on Xcode 16

Author: leogdion

.github/workflows/SundialKitBinary.yml

@@ -51,7 +51,9 @@ jobs:
       matrix:
         include:
           # SPM Build Matrix - Xcode 16.x+ (Swift 6.1+)
-          - runs-on: macos-15
+          - runs-on: macos-26
+            xcode: "/Applications/Xcode_26.1.app"
+          - runs-on: macos-26
             xcode: "/Applications/Xcode_26.0.app"
           - runs-on: macos-15
             xcode: "/Applications/Xcode_16.4.app"
@@ -60,7 +62,14 @@ jobs:
 
           # iOS Build Matrix - Xcode 16.x+ (Swift 6.1+)
           - type: ios
-            runs-on: macos-15
+            runs-on: macos-26
+            xcode: "/Applications/Xcode_26.1.app"
+            deviceName: "iPhone 17 Pro"
+            osVersion: "26.0"
+            download-platform: true
+
+          - type: ios
+            runs-on: macos-26
             xcode: "/Applications/Xcode_26.0.app"
             deviceName: "iPhone 17 Pro"
             osVersion: "26.0"
@@ -80,7 +89,14 @@ jobs:
 
           # watchOS Build Matrix - Xcode 16.x+ (Swift 6.1+)
           - type: watchos
-            runs-on: macos-15
+            runs-on: macos-26
+            xcode: "/Applications/Xcode_26.1.app"
+            deviceName: "Apple Watch Ultra 3 (49mm)"
+            osVersion: "26.0"
+            download-platform: true
+
+          - type: watchos
+            runs-on: macos-26
             xcode: "/Applications/Xcode_26.0.app"
             deviceName: "Apple Watch Ultra 3 (49mm)"
             osVersion: "26.0"