Use Xcode 16.3 for testing

PiperOrigin-RevId: 764695105
Change-Id: Ic6968c954b07a6ff3e83acc480a2a498f1795cc8

Author: derekmauro

ci/macos_xcode_bazel.sh

@@ -19,8 +19,8 @@
 
 set -euox pipefail
 
-# Use Xcode 16.0
-sudo xcode-select -s /Applications/Xcode_16.0.app/Contents/Developer
+# Use Xcode 16.3
+sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
 
 if [[ -z ${ABSEIL_ROOT:-} ]]; then
   ABSEIL_ROOT="$(realpath $(dirname ${0})/..)"

ci/macos_xcode_cmake.sh

@@ -16,8 +16,8 @@
 
 set -euox pipefail
 
-# Use Xcode 16.0
-sudo xcode-select -s /Applications/Xcode_16.0.app/Contents/Developer
+# Use Xcode 16.3
+sudo xcode-select -s /Applications/Xcode_16.3.app/Contents/Developer
 
 export CMAKE_BUILD_PARALLEL_LEVEL=$(sysctl -n hw.ncpu)
 export CTEST_PARALLEL_LEVEL=$(sysctl -n hw.ncpu)