feat: change DefaultServerPort to 9090 in trainer

[gaius-qi]

Description

• Change DefaultServerPort to 9090 in trainer.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #2348 (76f7b5f) into main (bb30434) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2348      +/-   ##
==========================================
- Coverage   49.69%   49.69%   -0.01%     
==========================================
  Files         148      148              
  Lines       19640    19640              
==========================================
- Hits         9761     9760       -1     
- Misses       9267     9268       +1     
  Partials      612      612              

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	49.69% <ø> (-0.01%)	⬇️

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see 1 file with indirect coverage changes