chore(dependabot): add pipelines requirements to config

[RobertCraigie]

Change Summary

I've noticed that dependabot isn't opening PRs for any of our test dependencies. As per dependabot/dependabot-core#2824 it looks like we have to explicitly add it as a separate entry in the config file.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Base: 94.33% // Head: 94.33% // No change to project coverage 👍

Coverage data is based on head (1cc662c) compared to base (0a14eb5).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #531   +/-   ##
=======================================
  Coverage   94.33%   94.33%           
=======================================
  Files         120      120           
  Lines        6073     6073           
  Branches     1039     1039           
=======================================
  Hits         5729     5729           
  Misses        301      301           
  Partials       43       43           

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