Update dependency jupyter-client to v6.1.12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
jupyter-client (source)	==6.1.11 -> ==6.1.12

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Release Notes

jupyter/jupyter_client

v6.1.12

Compare Source

• Shutdown request sequence has been modified to be more graceful, it
  now is preceded by interrupt, and will also send a SIGTERM before
  forcibly killing the kernel. #​620
• Removal of ipython_genutils as a dependency. It was implicit
  before; but required by at least traitlets thus avoiding issues. We
  are working on completely removing it from all jupyter dependencies;
  as it might lead to issues packaging for Python 3.10, and was mostly
  used for compatibility with python 2. (#​620, #​605)
• Address a race condition between shutdown_kernel and restarter.
  (#​607.)

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