support rank deficiency in prediction

[palday]

closes #642

Did behavior change? Did you add need features? If so, please update NEWS.md

• add entry in NEWS.md
• after opening this PR, add a reference and run docs/NEWS-update.jl to update the cross-references.

Should we release your changes right away? If so, bump the version:

• I've bumped the version appropriately

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (e5d8a6a) 95.89% compared to head (f7ad4eb) 95.90%.

❗ Current head f7ad4eb differs from pull request most recent head 443b786. Consider uploading reports for the commit 443b786 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #676   +/-   ##
=======================================
  Coverage   95.89%   95.90%           
=======================================
  Files          29       29           
  Lines        2731     2732    +1     
=======================================
+ Hits         2619     2620    +1     
  Misses        112      112           

Impacted Files	Coverage Δ
src/predict.jl	98.33% <100.00%> (+0.02%)	⬆️

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[dmbates]

One suggested change in wording in the release notes.