CompatHelper: add new compat entry for DifferentiationInterface at version 0.6 for package test, (keep existing compat)

[github-actions]

This pull request sets the compat entry for the DifferentiationInterface package to 0.6 for package test.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.
Note: Consider registering a new release of your package immediately after merging this PR, as downstream packages may depend on this for tests to pass.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.34%. Comparing base (5316700) to head (493619f).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #742   +/-   ##
=======================================
  Coverage   86.34%   86.34%           
=======================================
  Files          34       34           
  Lines        4254     4254           
=======================================
  Hits         3673     3673           
  Misses        581      581           

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[coveralls]

Pull Request Test Coverage Report for Build 12224339034

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 86.342%

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Totals
Change from base Build 12224001626:	0.0%
Covered Lines:	3673
Relevant Lines:	4254

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💛 - Coveralls