chore: only depend on tomli for python<3.11 #1252

Job	Run time
Check coding standards	30s
Run tests (Ubuntu, 3.8)	1m 52s
Run tests (Ubuntu, 3.9)	1m 45s
Run tests (Ubuntu, 3.10)	1m 52s
Run tests (Ubuntu, 3.11)	1m 50s
Run tests (Ubuntu, 3.12)	1m 46s
Run tests (MacOS, 3.8)	2m 33s
Run tests (MacOS, 3.9)	1m 27s
Run tests (MacOS, 3.10)	1m 19s
Run tests (MacOS, 3.11)	1m 28s
Run tests (MacOS, 3.12)	1m 18s
Run tests (Windows, 3.9)	3m 27s
Run tests (Windows, 3.10)	3m 11s
Run tests (Windows, 3.11)	3m 36s
Run tests (Windows, 3.12)	2m 53s
Build distribution	11s
Upload release to PyPI	0s
Sign the Python 🐍 distribution 📦 with Sigstore and upload them to GitHub Release	0s
Upload homebrew formula	0s
	30m 58s

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