Switch to Python 3.9 as a minimum requirement

[adamtheturtle]

No description provided.

[adamtheturtle]

Blocked on pylint-dev/pylint#3882.

[codecov]

Codecov Report

Merging #336 (238ac74) into master (f04c5f3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #336   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           14        14           
  Lines         1245      1249    +4     
  Branches        36        36           
=========================================
+ Hits          1245      1249    +4     

Impacted Files	Coverage Δ
src/vws_cli/commands.py	100.00% <100.00%> (ø)
src/vws_cli/options/credentials.py	100.00% <100.00%> (ø)
src/vws_cli/options/targets.py	100.00% <100.00%> (ø)
src/vws_cli/query.py	100.00% <100.00%> (ø)
tests/test_help.py	100.00% <100.00%> (ø)
tests/test_query.py	100.00% <100.00%> (ø)
tests/test_query_errors.py	100.00% <100.00%> (ø)

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