Add Metadata 2.2 support. (#97) #256

Job	Run time
sphinx-toolbox/default_values	1m 1s
sphinx-toolbox/dict2css	47s
sphinx-toolbox/extras_require	1m 6s
sphinx-toolbox/seed_intersphinx_mapping	1m 22s
sphinx-toolbox/sphinx-debuginfo	59s
sphinx-toolbox/sphinx-highlights	1m 4s
sphinx-toolbox/sphinx-toolbox	1m 37s
sphinx-toolbox/toctree_plus	48s
repo-helper/mkrecipe	1m 15s
domdfcoding/mathematical	1m 11s
python-coincidence/coincidence	41s
python-formate/formate	48s
python-formate/astatine	43s
python-formate/flake8-dunder-all	51s
python-formate/flake8-encodings	48s
python-formate/flake8-github-actions	42s
python-formate/flake8-helper	32s
python-formate/flake8-slots	45s
python-formate/flake8-sphinx-links	40s
python-formate/flake8_strftime	52s
python-formate/formate	47s
python-formate/snippet-fmt	1m 12s
	20m 31s

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