ci: Fix semantic release backmerge not working

[mtrezza]

Pull Request

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• Any contribution is under this license.
• Link this pull request to an issue.

Issue

Semantic release backmerge not working as it's incompatible with semantic release >= 20.

Approach

Downgrade semantic-release to 19.x

Tasks

n/a

[parse-github-assistant]

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[codecov]

Codecov Report

Base: 99.89% // Head: 99.89% // No change to project coverage 👍

Coverage data is based on head (4d229b7) compared to base (d93e936).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##            alpha    #1700   +/-   ##
=======================================
  Coverage   99.89%   99.89%           
=======================================
  Files          61       61           
  Lines        5984     5984           
  Branches     1372     1372           
=======================================
  Hits         5978     5978           
  Misses          6        6           

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[parseplatformorg]

🎉 This change has been released in version 4.0.1

[parseplatformorg]

🎉 This change has been released in version 4.0.0-alpha.8