Correct sessions test

[prabhupant]

Fixes #5481

Checklist

• I have read the Contribution & Best practices Guide and my PR follows them.
• My branch is up-to-date with the Upstream development branch.
• The unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

• All the functions created/modified in this PR contain relevant docstrings.

Short description of what this resolves:

adds the sessions factory in create sessions dredd hook

Changes proposed in this pull request:

• use sessions factory in place of event factory

[codecov]

Codecov Report

Merging #5482 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5482   +/-   ##
============================================
  Coverage        62.95%   62.95%           
============================================
  Files              263      263           
  Lines            12674    12674           
============================================
  Hits              7979     7979           
  Misses            4695     4695

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[prabhupant]

@iamareebjamal @srv-twry please review :)