Remove unused path from the C++ install

[darbyjohnston]

This change removes an unused path from the C++ installation. Previously the "any" and "optional" headers were installed into ${OTIO_RESOLVED_CXX_INSTALL_DIR}/include/opentimelineio/deps), but they were removed with the transition to C++17.

Currently trying to use the OTIO CMake config gives this error:

CMake Error in CMakeLists.txt:
  Imported target "OTIO::opentimelineio" includes non-existent path

    "install/include/opentimelineio/deps"

  in its INTERFACE_INCLUDE_DIRECTORIES.  Possible reasons include:

  * The path was deleted, renamed, or moved to another location.

  * An install or uninstall procedure did not complete successfully.

  * The installation package was faulty and references files it does not
  provide.

It looks like the Imath dependency is not installed to deps, but alongside OTIO:

$ ls install/include/
Imath  opentime  opentimelineio

An alternative fix would be to install Imath into deps, but I'm not sure which is more appropriate.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.72%. Comparing base (c0e97b0) to head (49b1a01).
Report is 59 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1882      +/-   ##
==========================================
+ Coverage   84.11%   84.72%   +0.61%     
==========================================
  Files         198      177      -21     
  Lines       22241    12809    -9432     
  Branches     4687     1191    -3496     
==========================================
- Hits        18709    10853    -7856     
+ Misses       2610     1773     -837     
+ Partials      922      183     -739     

Flag	Coverage Δ
py-unittests	84.72% <ø> (+0.61%)	⬆️

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see 135 files with indirect coverage changes

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[ssteinbach]

Whoops! nice catch. LGTM

[meshula]

deps was for interring libraries, I can't think of a reason to inter it.