Upgrade actions/setup-java to v6

[brunoborges]

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized it.
• All filenames are in PascalCase.
• All functions and variable names follow Java naming conventions.
• All new algorithms have a URL in their comments that points to Wikipedia or other similar explanations.
• All new algorithms include a corresponding test class that validates their functionality.
• All new code is formatted with clang-format -i --style=file path/to/your/file.java

Description

Upgrade all active workflows from actions/setup-java@v5.7.0 to actions/setup-java@v6.

Tests were not run (workflow-only change).

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.63%. Comparing base (9d05db2) to head (b1ce53c).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #7580   +/-   ##
=========================================
  Coverage     80.62%   80.63%           
  Complexity     7499     7499           
=========================================
  Files           816      816           
  Lines         24097    24097           
  Branches       4741     4741           
=========================================
+ Hits          19428    19430    +2     
+ Misses         3907     3906    -1     
+ Partials        762      761    -1     

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[brunoborges]

my apologies for this PR. It was only supposed to hit a set of repos with a specific dependabot configuration that would prevent getting the alert of this new release