Upgrade toolchain to v3 #51

Job	Run time
Run tests (3.11)	2m 30s
Run tests (3.12)	2m 9s
Check for erroneous constructs (3.11)	29s
Check for erroneous constructs (3.12)	25s
Check formatting (3.11)	21s
Check formatting (3.12)	22s
Check Markdown links	12s
Make pip packages	21s
Make Standalone	50s
Publish to PyPi	0s
Add ${{ matrix.artifact }} to release	-1s
	7m 38s

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