Fix NetBSD CI job

[tautschnig]

Per vmactions/netbsd-vm#20 adding -u should fix the package installation failure of git. (Adding -u will update packages if they are already installed, and will also update dependent packages.)

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• 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).
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• My PR is restricted to a single feature or bugfix.
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[Copilot]

Pull request overview

This PR fixes the NetBSD CI job by adding the -u flag to pkg_add commands to resolve package installation failures for git and its dependencies.

Changes:

• Added -u flag to pkg_add commands in the NetBSD workflow to update packages and their dependencies during installation

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.00%. Comparing base (844c8e6) to head (cc74ead).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8825   +/-   ##
========================================
  Coverage    80.00%   80.00%           
========================================
  Files         1700     1700           
  Lines       188332   188332           
  Branches        73       73           
========================================
  Hits        150679   150679           
  Misses       37653    37653           

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