tests: expand Python versions to 3.9 and 3.10

[sourcery-ai[bot]]

Sourcery Code Quality Report

❌  Merging this PR will decrease code quality in the affected files by 0.07%.

Quality metrics	Before	After	Change
Complexity	2.20 ⭐	2.20 ⭐	0.00
Method Length	69.60 🙂	70.00 🙂	0.40 👎
Working memory	8.00 🙂	8.00 🙂	0.00
Quality	75.65% ⭐	75.58% ⭐	-0.07% 👎

Other metrics	Before	After	Change
Lines	73	74	1

Changed files	Quality Before	Quality After	Quality Change
mss/tests/test_third_party.py	75.65% ⭐	75.58% ⭐	-0.07% 👎

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
mss/tests/test_third_party.py	test_pil_bgra	3 ⭐	95 🙂	11 😞	64.81% 🙂	Extract out complex expressions

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• ⛔ very poor

The 👍 and 👎 indicate whether the quality has improved or gotten worse with this pull request.

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