fix: swagger tx timestamp

[gfyrag]

Fix swagger

Fix missing transaction timestamp in swagger specification.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Refactoring / Technical debt

[codecov]

Codecov Report

Merging #297 (6db7e2f) into main (32edccd) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #297   +/-   ##
=======================================
  Coverage   72.04%   72.04%           
=======================================
  Files          82       82           
  Lines        4385     4385           
=======================================
  Hits         3159     3159           
  Misses        946      946           
  Partials      280      280           

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