Update supervisord
Update supervisord

This has fixed an issue of not being able to use the interactive
supervisorctl command.

Note that this just updates to a commit roughly two weeks ago, because
the subsequent commit - 5937dd8c375a876275c413bbffc4ad25e2dc060d - fails
to build on nix due to test errors.

policycompass/policycompass,FabiApfelkern/policycompass,policycompass/policycompass,FabiApfelkern/policycompass,policycompass/policycompass,FabiApfelkern/policycompass