chore: update JET & JLArrays compat

[gdalle]

• Bump JET to 0.11 (only on Julia 1.12)
• Bump JLArrays to 0.3
• Include test and docs deps in CompatHelper

Supersedes #872 and #862

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.14%. Comparing base (cf6ad3e) to head (d588c92).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #877      +/-   ##
==========================================
- Coverage   98.15%   98.14%   -0.02%     
==========================================
  Files         134      134              
  Lines        8018     8018              
==========================================
- Hits         7870     7869       -1     
- Misses        148      149       +1     

Flag	Coverage Δ
DI	98.83% <ø> (-0.02%)	⬇️
DIT	96.39% <ø> (ø)

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[gdalle]

Failing because of JuliaLang/Pkg.jl#4442