oak: bump mtl library for deprecation warning

[200sc]

WIthout this, running Init on OSX causes this output:

# dmitri.shuralyov.com/gpu/mtl
mtl.m:43:32: warning: 'supportsFeatureSet:' is deprecated: first deprecated in macOS 13.0 - Use supportsFamily instead [-Wdeprecated-declarations]
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/Metal.framework/Headers/MTLDevice.h:835:1: note: 'supportsFeatureSet:' has been explicitly marked deprecated here

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (3b840e6) to head (c2833fe).
Report is 2 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #224   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files         143      143           
  Lines        6403     6403           
=======================================
  Hits         6082     6082           
  Misses        288      288           
  Partials       33       33           

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