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Python 3.13 is the current version and was released over a month ago (see https://devguide.python.org/versions). The dependencies we use now support Python 3.13, most importantly `fonttools` which uses OS-specific builds and for which compatibility got introduced in https://github.com/fonttools/fonttools/pull/3656 and the corresponding `cp313` wheels for all distributions are published on https://pypi.org/project/fonttools/#files. Moreover, we fix forgotten `npx` usage in the font tests README which was encountered while testing this patch.
