chore: only depend on tomli for python<3.11 #1246

Job	Run time
Check coding standards	39s
Run tests (Ubuntu, 3.8)	36s
Run tests (Ubuntu, 3.9)	36s
Run tests (Ubuntu, 3.10)	32s
Run tests (Ubuntu, 3.11)	21s
Run tests (Ubuntu, 3.12)	20s
Run tests (MacOS, 3.8)	25s
Run tests (MacOS, 3.9)	27s
Run tests (MacOS, 3.10)	39s
Run tests (MacOS, 3.11)	24s
Run tests (MacOS, 3.12)	20s
Run tests (Windows, 3.9)	20s
Run tests (Windows, 3.10)	19s
Run tests (Windows, 3.11)	19s
Run tests (Windows, 3.12)	19s
Build distribution	0s
Upload release to PyPI	0s
Upload homebrew formula	0s
Sign the Python 🐍 distribution 📦 with Sigstore and upload them to GitHub Release	0s
	6m 36s

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