Appease Rubocop

[benjaminwil]

Summary

On two of my recent PRs, Rubocop got mad at the code in this commit body even though neither of my PRs touched this file. Thanks, Rubocop.

For posterity, here is the failure from this GitHub Actions run:

Run bin/rake lint:rb
bundle exec rubocop -P -f clang -f junit -o '/home/runner/work/solidus/solidus/tasks/../test-results/rubocop-results.xml' $(git ls-files -co --exclude-standard | grep -E "\.rb$" | grep -v "/templates/")
core/app/models/spree/stock_item.rb:109:9: C: [Correctable] Style/RedundantParentheses: Don't use parentheses around a method call.
        (saved_change_to_count_on_hand&.any? { |cache| cache < inventory_cache_threshold }) ||
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

1878 files inspected, 1 offense detected, 1 offense autocorrectable
rake aborted!
Command failed with status (1): [bundle exec rubocop -P -f clang -f junit -o '/home/runner/work/solidus/solidus/tasks/../test-results/rubocop-results.xml' $(git ls-files -co --exclude-standard | grep -E "\.rb$" | grep -v "/templates/")]
/home/runner/work/solidus/solidus/tasks/linting.rake:7:in `block (2 levels) in <top (required)>'
/home/runner/work/solidus/solidus/vendor/bundle/ruby/3.2.0/gems/rake-13.3.0/exe/rake:27:in `<top (required)>'
Tasks: TOP => lint:rb
(See full trace by running task with --trace)
Error: Process completed with exit code 1.

Checklist

The following are mandatory for all PRs:

• I agree that my PR will be published under the same license as Solidus.
• I have written a thorough PR description.
• I have kept my commits small and atomic.
• I have localized any and all user-facing strings that I added to the source code.
• I have used clear, explanatory commit messages.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.34%. Comparing base (fa8e686) to head (01e54fe).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6317   +/-   ##
=======================================
  Coverage   89.34%   89.34%           
=======================================
  Files         961      961           
  Lines       20161    20161           
=======================================
  Hits        18012    18012           
  Misses       2149     2149           

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