Request: permission to open a PR for a Hermes integration fix (unclosed aiohttp session after shutdown)

[XLakarX]

Hi Hindsight team,

I know CONTRIBUTING.md says external PRs are not accepted, so I'm asking first instead of opening one.

I found and fixed a bug in hindsight-integrations/hermes: after shutdown() the plugin can still create a new client, and the close is not done under the lock, which leaves an "Unclosed client session" warning (aiohttp). The fix is ready and tested (integration test suite: 142 passed), based on main @ 5331da2:

https://github.com/XLakarX/hindsight/tree/fix/hermes-client-closed-after-shutdown
(commit 193cdf3)

Would you be willing to accept it as a PR (or grant permission to open one)? If you prefer, I can instead file it as a bug report with a repro and you take the fix from the branch.

Thanks!