Support for rank deficiency in bootstrap

[palday]

closes #754

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

Attention: Patch coverage is 71.42857% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 96.45%. Comparing base (cfd3023) to head (cdc40d6).

Files	Patch %	Lines
src/simulate.jl	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #755      +/-   ##
==========================================
+ Coverage   96.33%   96.45%   +0.11%     
==========================================
  Files          34       34              
  Lines        3356     3354       -2     
==========================================
+ Hits         3233     3235       +2     
+ Misses        123      119       -4     

Flag	Coverage Δ
current	96.39% <71.42%> (+0.11%)	⬆️
minimum	96.35% <71.42%> (+0.11%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[ararslan]

Confirmed that this works in the case that motivated #754 and that

dropped_idx = findall((coef(model) .=== -0.0) .& isnan.(stderror(model)))
dropped_coefs = coefnames(model)[dropped_idx]
all(nt -> !(nt.coefname in dropped_coefs) || nt.β !== -0.0, boot.β)

is true. (Extending the added test to the case of multiple dropped columns)