This gets us Python 3.8, 3.9. In tree since 15th July.
If you agree/no objections, please add CC-ARCHES to the keywords.
Sanity check failed: > app-editors/retext-7.1.0 > depend amd64 stable profile default/linux/amd64/17.0 (39 total) > dev-python/markups[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > dev-python/python-markdown-math[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > depend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total) > dev-python/markups[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > dev-python/python-markdown-math[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > rdepend amd64 stable profile default/linux/amd64/17.0 (39 total) > dev-python/markups[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > dev-python/python-markdown-math[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > rdepend amd64 dev profile default/linux/amd64/17.0/no-multilib/prefix/kernel-3.2+ (2 total) > dev-python/markups[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)] > dev-python/python-markdown-math[-python_single_target_python3_7(-),-python_single_target_python3_8(-),-python_single_target_python3_9(-),python_targets_python3_7(-),python_targets_python3_8(-)]
amd64 stable
x86 stable, closing