[MRG] disable the fix_lint component of the py38 tests in tox.ini

[ctb]

The fix_lint set of tests is causing CI to fail:

tox: fix_lint - format the code base to adhere to our styles, and complain about what we cannot do automatically
  fix_lint installdeps: pre-commit>=2
  fix_lint installed: cfgv==3.3.1,distlib==0.3.4,filelock==3.4.2,identify==2.4.7,nodeenv==1.6.0,platformdirs==2.4.1,pre-commit==2.17.0,PyYAML==6.0,six==1.16.0,toml==0.10.2,virtualenv==20.13.0
  fix_lint run-test-pre: PYTHONHASHSEED='727383646'
  fix_lint run-test: commands[0] | pre-commit run --all-files --show-diff-on-failure
  [INFO] Initializing environment for https://github.com/pre-commit/pre-commit-hooks.
  [INFO] Initializing environment for https://github.com/akaihola/darker.
  [INFO] Installing environment for https://github.com/pre-commit/pre-commit-hooks.
  [INFO] Once installed this environment will be reused.
  [INFO] This may take a few minutes...
  [INFO] Installing environment for https://github.com/akaihola/darker.
  [INFO] Once installed this environment will be reused.
  [INFO] This may take a few minutes...
  Check python ast.........................................................Passed
  Check docstring is first.................................................Passed
  Check for merge conflicts................................................Passed
  Check Yaml...............................................................Passed
  Check Toml...............................................................Passed
  Debug Statements (Python)................................................Passed
  darker...................................................................Failed
  - hook id: darker
  - exit code: 1
  
  Traceback (most recent call last):
    File "/Users/runner/.cache/pre-commit/repokh7g6im_/py_env-python3/bin/darker", line 8, in <module>
      sys.exit(main())
    File "/Users/runner/.cache/pre-commit/repokh7g6im_/py_env-python3/lib/python3.8/site-packages/darker/__main__.py", line 196, in main
      args, config, config_nondefault = parse_command_line(argv)
    File "/Users/runner/.cache/pre-commit/repokh7g6im_/py_env-python3/lib/python3.8/site-packages/darker/command_line.py", line 163, in parse_command_line
      config = load_config(args.src)
    File "/Users/runner/.cache/pre-commit/repokh7g6im_/py_env-python3/lib/python3.8/site-packages/darker/config.py", line 37, in load_config
      path = find_project_root(tuple(srcs or ["."])) / "pyproject.toml"
  TypeError: unsupported operand type(s) for /: 'tuple' and 'str'

I can't replicate the problem locally, and it doesn't seem worth chasing down a problem that occurs in what seems to be an unreleased version of the darker package (which also isn't passing its own tests?).

So, I'm disabling it.

[codecov]

Codecov Report

Merging #1823 (61b2c2c) into latest (9083d20) will increase coverage by 6.67%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           latest    #1823      +/-   ##
==========================================
+ Coverage   83.48%   90.15%   +6.67%     
==========================================
  Files         113       87      -26     
  Lines       12183     8482    -3701     
  Branches     1627     1627              
==========================================
- Hits        10171     7647    -2524     
+ Misses       1754      577    -1177     
  Partials      258      258              

Flag	Coverage Δ
python	90.15% <ø> (ø)
rust	?

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

Impacted Files	Coverage Δ
src/sourmash/cli/compute.py	100.00% <ø> (ø)
src/sourmash/cli/sig/split.py	100.00% <ø> (ø)
src/sourmash/cli/sketch/dna.py	100.00% <ø> (ø)
src/sourmash/cli/sketch/protein.py	100.00% <ø> (ø)
src/sourmash/cli/sketch/translate.py	100.00% <ø> (ø)
src/core/src/index/search.rs
src/core/src/sketch/hyperloglog/estimators.rs
src/core/src/ffi/minhash.rs
src/core/src/ffi/utils.rs
src/core/src/index/sbt/mhbt.rs
... and 21 more

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[ctb]

ready for review @sourmash-bio/devs! Upon merge I will create an issue to revisit and perhaps re-enable the fix_lint tests at a later date.

[ctb]

thanks!