Fix Dask scheduler Client import error

[mattw-nws]

Description

Introduced in #967, f863b48, tethys_compute/models/dask/dask_scheduler.py , the changed code has lowercase client instead of Client, which imports the module instead of the class, resulting in a TypeError: 'module' object is not callable error.

Changes Made to Code:

• Client = optional_import("client", from_module="dask.distributed") ➡️ Client = optional_import("Client", from_module="dask.distributed")

Related

• Optional Dependencies #967

Additional Notes

• This bug might not appear on macOS HFS+/APFS because of case-insensitive filesystems? But I'm seeing it on Windows. I'm guessing this is the case everywhere though.

Quality Checks

• New code is 100% tested
• Code has been formated
• Code has been linted
• Docstrings for new methods have been added

[shawncrawley]

This review couldn't have been simpler. The change looks good to me.

[coveralls]

coverage: 100.0%. remained the same
when pulling c3f5349 on mattw-nws:bug-dask-scheduler-module-not-callable
into 8680dcf on tethysplatform:main.