Log Message:
py-pyobjc: updated to 6.1

Version 6.1
Updated for the macOS 10.15.1 SDK (Xcode 11.2)
Fix reference counting in -[OC_PythonData length], which resulted in use-after-free.
Fix problems found in pyobjc-core by the clang static analyser

Version 6.0.1
Remove debug print accidently left in production
Surpress “-Wunguarded-availability” warnings in the extension AppKit._inlines

Version 6.0
Removed Python 2 support from the C extension in pyobjc-core
Reformatted code in pyobjc-core:
- Use “black” for Python code
- Use “clang-format” for Objective-C code
Updated bindings for macOS 10.15 (Xcode 11.0)
The userspace driver frameworks introduced in macOS 10.15 (DriverKit and related \ 
frameworks) will not be exposed through PyObjC. Please let me know if you have a \ 
good use case for using these frameworks with Python.
Add new framework wrappers for all other new frameworks in macOS 10.15:

AuthenticationServices
CoreHaptics
CoreMotion
DeviceCheck
ExecutionPolicy
FileProvider
FileProviderUI
LinkPresentation
OSLog
PencilKit
PushKit
QuickLookThumbnailing
Speech
SoundAnalysis
SystemExtensions
Add new framework wrappers for a number of older frameworks:

MetalKit (new in macOS 10.11)
Fix crash when creating NSData objects on macOS 10.15