Test Downstream Packages

[blink1073]

Ensure that local changes are compatible with prerelease versions of downstream packages
Similar to the workflow used in traitlets.

[codecov-commenter]

Codecov Report

Merging #528 (927cd82) into master (abaa8cd) will decrease coverage by 1.49%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #528      +/-   ##
==========================================
- Coverage   77.78%   76.29%   -1.50%     
==========================================
  Files         106      110       +4     
  Lines        9103     9809     +706     
  Branches      971     1067      +96     
==========================================
+ Hits         7081     7484     +403     
- Misses       1674     1944     +270     
- Partials      348      381      +33     

Impacted Files	Coverage Δ
jupyter_server/tests/conftest.py	78.57% <0.00%> (-21.43%)	⬇️
jupyter_server/gateway/managers.py	60.00% <0.00%> (-16.84%)	⬇️
jupyter_server/_version.py	87.50% <0.00%> (-12.50%)	⬇️
jupyter_server/__main__.py	66.66% <0.00%> (-8.34%)	⬇️
jupyter_server/base/handlers.py	63.91% <0.00%> (-4.33%)	⬇️
jupyter_server/serverapp.py	64.88% <0.00%> (-1.96%)	⬇️
jupyter_server/files/handlers.py	29.16% <0.00%> (-1.95%)	⬇️
jupyter_server/tests/services/sessions/test_api.py	98.85% <0.00%> (-1.15%)	⬇️
jupyter_server/services/kernels/kernelmanager.py	80.07% <0.00%> (-1.03%)	⬇️
jupyter_server/pytest_plugin.py	90.76% <0.00%> (-0.96%)	⬇️
... and 29 more

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[mwakaba2]

lgtm!