- Fix flatbuffers flatc warning, unused-but-set-variable.
- Address `-Wshorten-64-to-32` warnings (fix in our code, allow in dependencies' code).
- Update CI builds to use Xcode 14.3.
- Update minimum iOS version to 12.0.
- Update Mac hosted agents to MacOS 13 where possible.
When building the FlatBuffers dependencies, gcc13 emits a
stringop-overflow warning. All warnings being turned into errors, that
fails the compilation of FlatBuffers, and as a consequence also fails
the build of onnxruntime.
This commit adds the application of a patch to FlatBuffers's
CMakeList.txt, to add -Wno-error=stringop-overflow to the
CMAKE_CXX_FLAGS.
