OTIO submodule update stuck on std::any C++ version issue

[jminor]

Dependabot updates to the OTIO version used in these Swift bindings are stuck on a C++ version issue. See this PR for example: #57

Example build errors:

In file included from /Users/runner/work/OpenTimelineIO-Swift-Bindings/OpenTimelineIO-Swift-Bindings/OpenTimelineIO/src/opentimelineio/serializableObject.h:9:
/Users/runner/work/OpenTimelineIO-Swift-Bindings/OpenTimelineIO-Swift-Bindings/OpenTimelineIO/src/opentimelineio/anyDictionary.h:29:58: error: no member named 'any' in namespace 'std'
class AnyDictionary : private std::map<std::string, std::any>
                                                    ~~~~~^
/Users/runner/work/OpenTimelineIO-Swift-Bindings/OpenTimelineIO-Swift-Bindings/OpenTimelineIO/src/opentimelineio/anyDictionary.h:32:11: error: use of undeclared identifier 'map'
    using map::map;
          ^

It is likely that we just need to specify C++17 in the build setup for these bindings to resolve this.