fix: Resolves #10535 -> unable to run tox testing

[john-bodley]

SUMMARY

Resolves #10535.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

Ran tox -e py37 locally.

ADDITIONAL INFORMATION

• Has associated issue: Unable to run tox testing #10535
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-commenter]

Codecov Report

Merging #10536 into master will decrease coverage by 0.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #10536      +/-   ##
==========================================
- Coverage   63.70%   63.56%   -0.14%     
==========================================
  Files         767      767              
  Lines       36283    36274       -9     
  Branches     3430     3430              
==========================================
- Hits        23115    23059      -56     
- Misses      13054    13101      +47     
  Partials      114      114              

Flag	Coverage Δ
#cypress	54.39% <ø> (+0.06%)	⬆️
#javascript	59.88% <ø> (ø)
#python	59.07% <ø> (-0.24%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset/db_engine_specs/presto.py	70.56% <0.00%> (-12.14%)	⬇️
superset/views/database/mixins.py	80.70% <0.00%> (-1.76%)	⬇️
superset/models/core.py	87.22% <0.00%> (-0.28%)	⬇️
superset/connectors/sqla/models.py	89.04% <0.00%> (-0.15%)	⬇️
superset/sql_parse.py	99.30% <0.00%> (-0.01%)	⬇️
superset/errors.py	100.00% <0.00%> (ø)
superset/viz_sip38.py	0.00% <0.00%> (ø)
superset-frontend/src/SqlLab/actions/sqlLab.js	62.60% <0.00%> (ø)
...rontend/src/SqlLab/components/QueryAutoRefresh.jsx	72.72% <0.00%> (+6.81%)	⬆️

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