Set pip_pre for Python 3.13 #297

Job	Run time
sphinx-toolbox/default_values	56s
sphinx-toolbox/dict2css	50s
sphinx-toolbox/extras_require	1m 5s
sphinx-toolbox/seed_intersphinx_mapping	1m 20s
sphinx-toolbox/sphinx-debuginfo	1m 2s
sphinx-toolbox/sphinx-highlights	59s
sphinx-toolbox/sphinx-toolbox	1m 38s
sphinx-toolbox/toctree_plus	47s
repo-helper/mkrecipe	1m 6s
domdfcoding/mathematical	1m 4s
python-coincidence/coincidence	43s
python-formate/formate	48s
python-formate/astatine	41s
python-formate/flake8-dunder-all	47s
python-formate/flake8-encodings	41s
python-formate/flake8-github-actions	43s
python-formate/flake8-helper	41s
python-formate/flake8-slots	40s
python-formate/flake8-sphinx-links	42s
python-formate/flake8_strftime	37s
python-formate/formate	53s
python-formate/snippet-fmt	1m 7s
	19m 50s

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