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manifest: Use asyncio.gather with fail-fast behaviour

asyncio.gather does not cancel sibling tasks when one fails, so if one
checker raises an unhandled exception, other tasks running I/O may keep
the event loop alive indefinitely. So use asyncio_gather_failfast to
detect failures and explicitly cancel+drain all pending tasks before
re-raising the exception.

In Python 3.11+ this is offered by TaskGroup but it is cheap to
use a wrapper here.

See https://github.com/python/cpython/issues/75633

Fixes: https://github.com/flathub-infra/flatpak-external-data-checker/issues/420

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