fix(ci): Select Xcode 16.4 in combine workflow (#15224)

Author: ncooke3

.github/workflows/combine.yml

@@ -67,6 +67,9 @@ jobs:
 
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
 
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
+
     - name: Install xcpretty
       run: gem install xcpretty
 
@@ -88,6 +91,8 @@ jobs:
       with:
         cache_key: ${{ matrix.os }}
     - uses: ruby/setup-ruby@354a1ad156761f5ee2b7b13fa8e09943a5e8d252 # v1
+    - name: Xcode
+      run: sudo xcode-select -s /Applications/Xcode_16.4.app/Contents/Developer
     - name: Setup Bundler
       run: scripts/setup_bundler.sh
     - name: Install xcpretty