Support for GHC 8.10

Merge pull request #1190 from gibiansky/dependabot/npm_and_yarn/jupyterlab-ihaskell/node-fetch-2.6.1

build(deps): bump node-fetch from 2.6.0 to 2.6.1 in /jupyterlab-ihaskell

Bumps [node-fetch](https://github.com/bitinn/node-fetch) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/bitinn/node-fetch/releases)
- [Changelog](https://github.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md)
- [Commits](https://github.com/bitinn/node-fetch/compare/v2.6.0...v2.6.1)
Signed-off-by: dependabot[bot] <support@github.com>

build(deps): bump notebook from 6.0.3 to 6.1.5

Bumps [notebook](https://github.com/jupyter/jupyterhub) from 6.0.3 to 6.1.5.
- [Release notes](https://github.com/jupyter/jupyterhub/releases)
- [Changelog](https://github.com/jupyterhub/jupyterhub/blob/master/CHECKLIST-Release.md)
- [Commits](https://github.com/jupyter/jupyterhub/commits)
Signed-off-by: dependabot[bot] <support@github.com>

add codemirror command line flag

update ihaskell jupyterlab extension and align directory name

Bump mimetypes of vega

Add dynamic flag to load extra shared library

Add mimetype to Kernel Info Reply message

sendMessage mhMetadata

Send the header metadata with a message instead of ignoring the header
metadata and sending "{}".

The header metadata is handled correctly on receipt of a message. Why
was it ignored on sending? Probably no-one ever needed it.