try removing pyobjc since keyboard module no longer used.

requirements.txt

@@ -15,9 +15,6 @@ pyserial>=3.5
 h5py>=3.1.0
 pytest-shutil
 pyo>=1.0.3; platform_system == "Linux"
-#keyboard requires pyobjc, psychopy requires version less than 8, setting pyobjc to
-# a specific version prevents dependency resolution deadlock.
-pyobjc==7.3; sys_platform == 'darwin'
 #Removed keyboard dependency due to using Carbon API not supported on Apple ARM64 chips, 
 #pynput is supported and under active development.
 #keyboard==0.13.5
@@ -39,9 +36,6 @@ pyserial>=3.5
 h5py>=3.1.0
 pytest-shutil
 pyo>=1.0.3; platform_system == "Linux"
-#keyboard requires pyobjc, psychopy requires version less than 8, setting pyobjc to
-# a specific version prevents dependency resolution deadlock.
-pyobjc==7.3; sys_platform == 'darwin'
 #Removed keyboard dependency due to using Carbon API not supported on Apple ARM64 chips, 
 #pynput is supported and under active development.
 #keyboard==0.13.5
@@ -54,9 +48,6 @@ click
 
 ## ~~ Stimpres Requirements ~~
 
-#keyboard requires pyobjc, psychopy requires version less than 8, setting pyobjc to
-# a specific version prevents dependency resolution deadlock.
-pyobjc==7.3; sys_platform == 'darwin'
 #upgrade psychopy to use newer wxpython dependency which is prebuilt for m1 support.
 psychopy==2023.2.2
 # PTB does not yet support macOS ARM64, need to fallback to sounddevice.