CompatHelper: bump compat for MLDatasets to 0.7 for package nmf, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the MLDatasets package from 0.5 to 0.5, 0.7 for package nmf.
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.

[coveralls]

Pull Request Test Coverage Report for Build 2364789389

• 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 95.426%

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Totals
Change from base Build 1768612297:	0.0%
Covered Lines:	605
Relevant Lines:	634

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💛 - Coveralls

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.42%. Comparing base (a82e3fb) to head (ecbe8c8).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #168   +/-   ##
=======================================
  Coverage   95.42%   95.42%           
=======================================
  Files          14       14           
  Lines         634      634           
=======================================
  Hits          605      605           
  Misses         29       29           

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