Log message:
py-pyobjc: updated to 6.2.1

Version 6.2.1
* Ensure package ‘pyobjc’ won’t try to build the PubSub bindings on macOS 10.15
* Minor tweaks to build and pass tests on macOS 10.14 with the latest Xcode that \ 
can be installed on that version of macOS.
* Fix SystemError in block edge case
* PyObjC raised a SystemError when converting a callable into an ObjC block when \ 
the callable is a bound method without positional arguments.
* Fix crash on catalina caused by writing to read-only memory.
* Make sure the SDK detection works when the version is not in the SDK name
* There were no SDK updates in Xcode 11.5 and Xcode 11.6 (beta)

Log message:
py-pyobjc: updated to 6.2

Version 6.2

The project has moved from Bitbucket to Github

Remove most remnants of Python 2 support

Clean up code quality issues found using flake8

Add pre-commit hook to run black on all Python code.

Fix protocol conformance testing when explicitly implementing a protocol

Before this bugfix a class explicitly conforming to a protocol could not \ 
implement any method that wasn’t declared in the protocol, the bridge would \ 
erroneously raise an exception when checking the additional method.

Issue reported by Georg Seifert.

Fix Python 3 issues in PyObjCTools.Conversion

Reported by vinolin asokan.

PyObjCTools.Conversio.propertyListFromPythonCollection didn’t
recursively convert members of lists and tuples.

PyObjCTools.Conversio.propertyListFromPythonCollection and \ 
PyObjCTools.Conversio.pythonCollectionFromPropertyList now support sets.

Update metadata for Xcode 11.4 (beta 2)

Added bindings for framework AutomaticAssessmentConfiguration.framework \ 
introduced in macOS 10.15.4

In some cases the compiler uses the type encoding “^{NSObject=#}” instead of \ 
“@”.

Reported by Georg Seifert.

Added bindings for the Metal framework (new in macOS 10.11)

Most framework bindings now use the limited ABI for the included C extensions, \ 
reducing the number of wheels that are needed. The exception are the bindings \ 
for Cocoa, Quartz and libdispatch, those use functionality not available in the \ 
limited ABI.

The bridge itself (pyobjc-core) still uses the full CPython API.

The CoreAudio bindings also don’t use the limited ABI for now, those need more \ 
work to work with that ABI.