Jupyterlab-spreadsheet

- Fix 35 'A' Column not shown when it is blank
- Fix 37 Unable to build Jupyter lab 3.0.14
- Update dependencies to resolve low-severity security advisories

This release fixes some build issues encountered in newer versions of
JupyterLab, as well as a bug that incorrectly displayed sheets that had empty
leading rows and/or columns.

- Update for JupyterLab 3

This fix was contributed by NQuigley02

- Chore: Update dependency to resolve security issue

GitHub released a security advisory for versions of jQuery less than 3.5.0.
This update makes the plugin explicitly depend on 3.5.0, which includes a fix
for that advisory.

cf. https://github.com/advisories/GHSA-gxr4-xjj5-5px2

- Add: JupyterLab 2.0 compatibility

Functional changes were planned for this release, but retracted due to
compatibility issues with JupyterLab 2.0 and will instead ship in a later
release. Minor version bumped to prevent older installs from picking this
version up.

- Add: JupyterLab 1.1 compatibility

This release includes no functional changes. The minor version was bumped to
prevent 1.0 installs from picking this up erroneously.