Merge pull request #305 from Carreau/bump-ipykernel

Test effect of un-pinning ipykernel.

.github/workflows/test.yml

@@ -31,7 +31,7 @@ jobs:
     - name: Install and update Python dependencies on Python 3
       run: |
         python -m pip install --upgrade pip setuptools wheel
-        python -m pip install --upgrade "pexpect>=3.3" 'pytest<7' rlipython ipykernel==5.4.3 requests jupyter flaky 'notebook<6.1' 'prompt_toolkit<3.0.15' wheel 'jupyter_console>=6.2' 'pytest-cov<3' ipython 'coverage<6.3' pytest-json-report
+        python -m pip install --upgrade "pexpect>=3.3" 'pytest<7' rlipython 'ipykernel>=5.4.3' requests jupyter flaky 'notebook<6.1' 'prompt_toolkit<3.0.15' wheel 'jupyter_console>=6.2' 'pytest-cov<3' ipython 'coverage<6.3' pytest-json-report
         pip install -e .
     - name: test release build
       run: |