CompatHelper: bump compat for Flux in [weakdeps] to 0.16 for package DifferentiationInterfaceTest, (keep existing compat)

[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 53.77%. Comparing base (0f3d2c1) to head (72a56a5).

❗ There is a different number of reports uploaded between BASE (0f3d2c1) and HEAD (72a56a5). Click for more details.

HEAD has 72 uploads less than BASE

Flag	BASE (0f3d2c1)	HEAD (72a56a5)
DI	70	6
DIT	16	8

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #664       +/-   ##
===========================================
- Coverage   97.60%   53.77%   -43.83%     
===========================================
  Files         112      104        -8     
  Lines        5592     5484      -108     
===========================================
- Hits         5458     2949     -2509     
- Misses        134     2535     +2401     

Flag	Coverage Δ
DI	31.78% <ø> (-66.98%)	⬇️
DIT	95.36% <ø> (ø)

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