`ENETUNREACH` is semantically equivalent to `EHOSTUNREACH` (which is
already in `_NO_RETRY_ERRORS`) — both indicate the destination cannot be
reached at the network layer. Retrying immediately will not resolve the
condition.
In containerized environments (e.g., Home Assistant running in Docker
with bridge networking), a single ICMP "Network unreachable" response
can temporarily poison the container's routing cache. The unnecessary
retries reinforce the poisoned cache entry, causing cascading failures
for other devices on the same subnet.
Ruff 0.9 contains a number of formatter changes for the 2025 style guide.
Update to `ruff>=0.9.0` and apply the formatter fixes.
https://astral.sh/blog/ruff-v0.9.0
Python 3.11 ships with latest Debian Bookworm.
pypy is not that widely used with this library based on statistics. It could be added back when pypy supports python 3.11.
