Avoid brew symlink conflict in macos-13

[tautschnig]

GitHub images already have maven installed, and upgrading to the latest version of maven via brew results in symlink conflicts of the python 3.12 dependency (earlier reported in actions/runner-images#4020).

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.37%. Comparing base (0acd97d) to head (97e615f).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8338   +/-   ##
========================================
  Coverage    78.37%   78.37%           
========================================
  Files         1726     1726           
  Lines       188322   188322           
  Branches     18444    18460   +16     
========================================
  Hits        147606   147606           
  Misses       40716    40716           

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