CompatHelper: bump compat for Flux in [weakdeps] to 0.16 for package DifferentiationInterfaceTest

[github-actions]

This pull request changes the compat entry for the Flux package from 0.13,0.14 to 0.13,0.14, 0.16 for package DifferentiationInterfaceTest.
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.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.29%. Comparing base (0f3d2c1) to head (af952d8).

❗ There is a different number of reports uploaded between BASE (0f3d2c1) and HEAD (af952d8). Click for more details.

HEAD has 79 uploads less than BASE

Flag	BASE (0f3d2c1)	HEAD (af952d8)
DI	70	7
DIT	16	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #663       +/-   ##
===========================================
- Coverage   97.60%   41.29%   -56.31%     
===========================================
  Files         112       86       -26     
  Lines        5592     3601     -1991     
===========================================
- Hits         5458     1487     -3971     
- Misses        134     2114     +1980     

Flag	Coverage Δ
DI	41.29% <ø> (-57.47%)	⬇️
DIT	?

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