Missing `decref` on the error path in `_interpqueuesmodule` and `_interpchannelsmodule` modules

[aisk]

Bug report

Bug description:

This is found by Claude Code. See the comming PR for detail.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-149921: Fix reference leaks in _interpchannels and _interpqueues modules #149922