build(subscription): mock-socket as dev dep

[ghost]

Description

This PR sets mock-socket as dev dependency since it's for testing.

Motivation and Context

How has this been tested?

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 not work as expected)

Checklist:

• [ ] Add tests to cover changes as needed.
• [ ] Update documentation as needed.

[codecov-commenter]

Codecov Report

Merging #381 (f9937f0) into dev (39493f7) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #381   +/-   ##
=======================================
  Coverage   80.98%   80.98%           
=======================================
  Files          44       44           
  Lines        1804     1804           
  Branches      329      329           
=======================================
  Hits         1461     1461           
  Misses        342      342           
  Partials        1        1           

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