COMP: Use dynamic Xcode selection instead of hardcoded version

The macos-14 runner no longer has Xcode 14.3.1 installed. Instead
of hardcoding a specific Xcode version, detect the latest installed
Xcode app dynamically. This approach works across runner updates
without needing to track which Xcode versions are pre-installed.

  xcode-select: error: invalid developer directory
    '/Applications/Xcode_14.3.1.app'

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hjmjohnson

.github/workflows/build-test-publish.yml

@@ -44,10 +44,11 @@ jobs:
       - name: Get specific version of CMake, Ninja
         uses: lukka/get-cmake@v3.24.2
 
-      - name: Specific XCode version
-        if: matrix.os == 'macos-14'
+      - name: Select Xcode
+        if: startsWith(matrix.os, 'macos')
         run: |
-          sudo xcode-select -s "/Applications/Xcode_14.3.1.app"
+          XCODE_APP=$(ls -d /Applications/Xcode*.app 2>/dev/null | sort -V | tail -1)
+          sudo xcode-select -s "${XCODE_APP}/Contents/Developer"
 
       - name: Download ITK
         run: |