ci: slightly increase tolerance for test_wilcoxon_tie_correction

[flying-sheep]

• Closes Test failure in pre job: test_wilcoxon_tie_correction started failing #3921
• Tests included or not required because:

• Release notes not necessary because: ci-only fix

If you want to figure out what happened, be my guest: https://scipy.github.io/devdocs/release/1.17.0-notes.html

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.73%. Comparing base (452c4f6) to head (b7639c1).
⚠️ Report is 42 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #3922       +/-   ##
=========================================
+ Coverage      0   76.73%   +76.73%     
=========================================
  Files         0      116      +116     
  Lines         0    12403    +12403     
=========================================
+ Hits          0     9517     +9517     
- Misses        0     2886     +2886     

Flag	Coverage Δ
hatch-test.pre	76.73% <ø> (?)

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see 116 files with indirect coverage changes