Fix failing import of PIL.Image.Resampling for certain Pillow versions

[MaxGyver83]

Fixes #3991.

[totaam]

Can you please amend to use the same form as this one:

xpra/xpra/codecs/pillow/encoder.py

Lines 23 to 35 in 2cbcaf8

	try:
	# pylint: disable=ungrouped-imports
	from PIL.Image import Palette, Resampling
	ADAPTIVE = Palette.ADAPTIVE
	WEB = Palette.WEB
	NEAREST = Resampling.NEAREST
	BILINEAR = Resampling.BILINEAR
	BICUBIC = Resampling.BICUBIC
	LANCZOS = Resampling.LANCZOS
	except ImportError:
	#location for older versions:
	from PIL.Image import ADAPTIVE, WEB # type: ignore
	from PIL.Image import NEAREST, BILINEAR, BICUBIC, LANCZOS # type: ignore

Rationale: The “Easier to Ask Forgiveness Than Permission” (EAFP) Style

[MaxGyver83]

Rationale: The “Easier to Ask Forgiveness Than Permission” (EAFP) Style

I expected this 😄 But I then I didn't change to try/except because I wanted to wait first if you care at all about Ubuntu 20.04.

[totaam]

More complete solution here:
35f77d9

[MaxGyver83]

More complete solution here: 35f77d9

Great! Thank you.