Bump ipykernel from 6.15.1 to 6.15.2 in /python (#409)

Bumps [ipykernel]() from 6.15.1 to 6.15.2.

---
updated-dependencies:
- dependency-name: ipykernel
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

python/requirements.txt

@@ -1,6 +1,6 @@
 aiocontextvars==0.2.2; python_version<"3.7"
 contextvars==2.4; python_version<"3.7"
-ipykernel==6.15.1
+ipykernel==6.15.2
 numpy==1.19.5  # needs to stay compatible with latest tensorflow
 python-socketio[client]==5.4.1
 python-engineio==4.1.0