Remove jupyter-bundlerextension entry point

[ericpre]

When running constructor with jupyter_server and notebook in the specs, there is the following error:

Error: File 'bin/jupyter-bundlerextension' found in multiple packages: jupyter_server-1.2.2-py38h578d9bd_0.tar.bz2, notebook-6.2.0-py38h578d9bd_0.tar.bz2

Indeed, jupyter-bundlerextension entry point has been removed in jupyter-server/jupyter_server#194 and there it should be removed in this feedstock too.

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

.

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[blink1073]

Thanks!

[bollwyvl]

Awesome, thank you.