Add --local flag to lightning serve command in minimal_run.py

[aniketmaurya]

What does this PR do?

This PR adds the --local flag to the lightning serve command to ensure the server runs locally.

The command to run server has been changed from default local to opt-in to local so we need to add the --local argument.

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89%. Comparing base (c83e0f5) to head (f6c7d4b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #461   +/-   ##
===================================
  Coverage    89%    89%           
===================================
  Files        37     37           
  Lines      2155   2155           
===================================
  Hits       1911   1911           
  Misses      244    244           

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