CompatHelper: bump compat for DataGraphs to 0.5, (keep existing compat)

[ITensorBot]

Bumps the DataGraphs compat entry from 0.4.1 to 0.4.1, 0.5 in both the package Project.toml and the test Project.toml, so the package and its tests move to DataGraphs 0.5 together. This consolidates the companion test-compat bump that was originally opened separately as #375 (now closed).

The full test suite passes against DataGraphs 0.5.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.87%. Comparing base (f32e189) to head (20a13b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   76.91%   76.87%   -0.04%     
==========================================
  Files          58       58              
  Lines        2638     2638              
==========================================
- Hits         2029     2028       -1     
- Misses        609      610       +1     

Flag	Coverage Δ
docs	51.70% <ø> (-0.02%)	⬇️

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