better compatibility with RegressionFormulae.jl

[palday]

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

[kleinschmidt]

looks good, the <:MixedModel restriction on the apply_schema method SHOULD mean that the @formula time still works as intended...but maybe worth checking even informally that this still works with RegressionFormulae.jl loaded?

[palday]

julia> using MixedModels, RegressionFormulae

julia> using MixedModels: dataset

julia> psts = dataset(:pastes)
Arrow.Table with 60 rows, 3 columns, and schema:
 :batch     String
 :cask      String
 :strength  Float64

julia> m = fit(MixedModel, @formula(strength ~ 1 + (1|batch/cask)), psts; progress=false)
Linear mixed model fit by maximum likelihood
 strength ~ 1 + (1 | batch) + (1 | batch & cask)
   logLik   -2 logLik     AIC       AICc        BIC    
  -123.9972   247.9945   255.9945   256.7217   264.3718

Variance components:
                Column   Variance Std.Dev. 
batch & cask (Intercept)  8.433617 2.904069
batch        (Intercept)  1.199180 1.095071
Residual                  0.678002 0.823409
 Number of obs: 60; levels of grouping factors: 30, 10

  Fixed-effects parameters:
─────────────────────────────────────────────────
               Coef.  Std. Error      z  Pr(>|z|)
─────────────────────────────────────────────────
(Intercept)  60.0533    0.642136  93.52    <1e-99
─────────────────────────────────────────────────

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.13 ⚠️

Comparison is base (8ae74f7) 95.90% compared to head (160ed17) 95.77%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #677      +/-   ##
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- Coverage   95.90%   95.77%   -0.13%     
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  Files          29       28       -1     
  Lines        2733     2725       -8     
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- Hits         2621     2610      -11     
- Misses        112      115       +3     

Impacted Files	Coverage Δ
src/randomeffectsterm.jl	95.34% <ø> (-1.21%)	⬇️

... and 2 files with indirect coverage changes

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