Update macOS version in functional test workflow

Author: KazuCocoa

.github/workflows/functional-test.yml

@@ -55,7 +55,7 @@ jobs:
             platform: tvOS
             wdaName: WebDriverAgentRunner_tvOS-Runner.app
 
-    runs-on: macos-15
+    runs-on: macos-26
 
     # Please make sure the available Xcode versions and iOS versions
     # on the runner images. https://github.com/actions/runner-images
@@ -80,7 +80,7 @@ jobs:
 
     - uses: futureware-tech/simulator-action@v5
       with:
-        # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-arm64-Readme.md
+        # https://github.com/actions/runner-images/blob/main/images/macos/macos-26-arm64-Readme.md
         model: ${{ env.IOS_DEVICE_NAME }}
         os_version: ${{ env.IOS_VERSION }}
         wait_for_boot: true
@@ -123,7 +123,7 @@ jobs:
           test/report/
 
   ios_test_with_other_deps:
-    runs-on: macos-15
+    runs-on: macos-26
 
     # Please make sure the available Xcode versions and iOS versions
     # on the runner images. https://github.com/actions/runner-images
@@ -148,7 +148,7 @@ jobs:
 
     - uses: futureware-tech/simulator-action@v5
       with:
-      # https://github.com/actions/runner-images/blob/main/images/macos/macos-15-arm64-Readme.md
+      # https://github.com/actions/runner-images/blob/main/images/macos/macos-26-arm64-Readme.md
         model: ${{ env.IOS_DEVICE_NAME }}
         os_version: ${{ env.IOS_VERSION }}
         wait_for_boot: true