Bump robot version to v1.8.3 and address robot errors

[caufieldjh]

This isn't the most recent version of robot, but it is the most recent version that works.
Something strange happens between v1.8.3 and v1.8.4 causing OWL parsing to fail.

[caufieldjh]

Getting errors in transforming to obograph json from OWL

[caufieldjh]

I think there's an issue with the way the owl is being parsed:

In bfo, used this value for version: versionIRI
Don't have this version of bfo yet - will transform.
Could not parse OWL definitions enough to locate any imports.
No imports found for bfo.
Completed download from <MagicMock name='get_url()' id='140150636974528'> to /tmp/bfohspsfkui.
Moving from /tmp/bfohspsfkui to data/bfo/2019-08-26/bfo.owl.
ROBOT preprocessing: relax bfo
Relaxing /tmp/bfohspsfkui to /tmp/tmpwon_asiu_bfo_relaxed.owl...
Complete.
Before relax: 0 lines. After relax: 15 lines.

[caufieldjh]

This test error does not occur on a local run of pytest. Weird.
Or they don't, that is, until I update robot to v1.9.4.
With that version, the relaxed bfo produced is empty because the mocked bfo is an empty file.

[caufieldjh]

Works with robot:

• 1.8.2
• 1.8.3
  but fails on v1.8.4 and subsequent versions.

Don't think it's the java version - I'm on v17 locally.