This commit doesn't disable py3.12 for all packages but for a few ones
that were producing CI failures and their revdeps, which were the next:
app-dicts/dialect
app-text/frog
dev-nim/nimbus
dev-embedded/esp-idf
dev-python/celery
dev-python/ManimPango
dev-python/menshen-client
dev-python/sphinx-hoverxref
dev-python/sphinxext-opengraph
dev-python/jinja2-cli: enable py3.13, py3.14 and disable py3.12
media-video/manimgl
Signed-off-by: David Roman <stkw0@disroot.org>