typing_extensions dependency version conflict with other addons

[Andrej730]

Hi, got feedback for other addon (BlenderBIM, IfcOpenShell/IfcOpenShell#4691) that it's failed to load with an error message:

  File "C:\Users\Sahru\AppData\Roaming\Blender Foundation\Blender\4.1\scripts\addons\blenderbim\libs\site\packages\xsdata\formats\dataclass\typing.py", line 18, in <module>
    from typing_extensions import ForwardRef
ImportError: cannot import name 'ForwardRef' from 'typing_extensions' (C:\Users\Sahru\AppData\Roaming\Blender Foundation\Blender\4.1\scripts\addons\MeasureIt_ARCH-development\libs\typing_extensions.py)

MeasureIt_ARCH comes with older typing_extensions version (2 years old) that didn't had ForwardRef yet.

As a workaround users can:

1. Disable both MeasureIt_ARCH and another addon that's breaking.
2. Restart Blender.
3. Enable breaking addon first, so it will load newer version of dependency.
4. Enable MeasureIt_ARCH.

Not sure if there's any need to actually update typing_extensions in the MeasureIt_ARCH if it works fine without update, just wanted to give a heads up for anyone meeting a similar issue and noticing MeasureIt_ARCH at the end of the traceback.