Fix up CI config

- Ensure the lastest stable Xcode on the image is used.
- Work around an issues with visionOS tests in the lastest image by explicitly
  targeting an OS version.

Author: thomasvl

.github/workflows/cocoapods.yml

@@ -32,6 +32,10 @@ jobs:
         extra_flags: ["", "--use-static-frameworks"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: "iOS, macOS, tvOS, and visionOS"
       run:  |
         pod lib lint --verbose ${{ matrix.extra_flags }} \
@@ -62,6 +66,10 @@ jobs:
         pod_configuration: ["Debug", "Release"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: "macOS"
       run:  |
         pod lib lint --verbose \

.github/workflows/examples.yml

@@ -38,6 +38,10 @@ jobs:
         SAMPLE: ["Calendar", "Drive", "YouTube", "Storage"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: Build Debug
       run:  |
         set -eu

.github/workflows/service_generator.yml

@@ -36,6 +36,10 @@ jobs:
         CONFIGURATION: ["debug", "release"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: Build ServiceGenerator
       run:  |
         set -eu
@@ -50,6 +54,10 @@ jobs:
         CONFIGURATION: ["Debug", "Release"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: Build ServiceGenerator
       run:  |
         set -eu

.github/workflows/swiftpm.yml

@@ -31,6 +31,10 @@ jobs:
         CONFIGURATION: ["debug", "release"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: Build and Test Library
       run:  |
         set -eu
@@ -48,6 +52,10 @@ jobs:
         CONFIGURATION: ["Debug", "Release"]
     steps:
     - uses: actions/checkout@v4
+    - name: Select Xcode Version
+      uses: maxim-lobanov/setup-xcode@v1
+      with:
+        xcode-version: 'latest-stable'
     - name: Build and Test Library
       run:  |
         set -eu
@@ -62,7 +70,9 @@ jobs:
             DESTINATION="platform=tvOS Simulator,name=Apple TV,OS=latest"
             ;;
           visionos)
-            DESTINATION="platform=visionOS Simulator,name=Apple Vision Pro,OS=latest"
+            # As of Aug 15, 2025, "latest" was failing as it matched both the
+            # beta and GM, use explict GM.
+            DESTINATION="platform=visionOS Simulator,name=Apple Vision Pro,OS=2.5"
             ;;
           watchos)
             DESTINATION="platform=WatchOS Simulator,name=Apple Watch Series 10 (46mm),OS=latest"