fix Core.Boxes in the package

[KristofferC]

Found using the script in JuliaLang/julia#60478

[KristofferC]

I don't understand how the changes here would cause the CI error, they also seem to pass locally...

Test Summary:                              | Pass  Total   Time
instantiate: changes to the active project |   19     19  18.2s
Test.DefaultTestSet("instantiate: changes to the active project", false, true, false, "REPL[12

Locally:

┌ Info: active_project
└   Base.active_project() = "/tmp/jl_31Pecw/environments/v1.14/Project.toml"
┌ Info: project_file
│   env.project_file = "/tmp/jl_31Pecw/environments/v1.14/Project.toml"
└   isfile(env.project_file) = false
┌ Info: manifest_file
│   env.manifest_file = "/tmp/jl_31Pecw/environments/v1.14/Manifest.toml"
└   isfile(env.manifest_file) = true
┌ Info: manifest_names
└   Base.manifest_names = ("JuliaManifest-v1.14.toml", "Manifest-v1.14.toml", "JuliaManifest.toml", "Manifest.toml")
[ Info: manifest pkg names:
  SimplePackage fc6b7c0f-8a2f-4256-bbf4-8c72c30df5be
  Example d359f271-ef68-451f-b4fc-6b43e571086c
  Base64 2a0f44e3-6c83-55bd-87e4-b1978d98bd5f
  StyledStrings f489334b-da3d-4c2e-b8f0-e476e12c162b
  Example 7876af07-990d-54b4-ab0e-23690620f79a
  Markdown d6f4376e-aef5-505a-96c1-9c027394607a
  JuliaSyntaxHighlighting ac6e5ff7-fb65-4e79-a425-ec3bc9c03011

CI:

┌ Info: active_project
└   Base.active_project() = "/tmp/jl_7utAzv/environments/v1.14/Project.toml"
┌ Info: project_file
│   env.project_file = "/tmp/jl_7utAzv/environments/v1.14/Project.toml"
└   isfile(env.project_file) = true
┌ Info: manifest_file
│   env.manifest_file = "/tmp/jl_7utAzv/environments/v1.14/Manifest.toml"
└   isfile(env.manifest_file) = true
┌ Info: manifest_names
└   Base.manifest_names = ("JuliaManifest-v1.14.toml", "Manifest-v1.14.toml", "JuliaManifest.toml", "Manifest.toml")
[ Info: manifest pkg names:
  Markdown d6f4376e-aef5-505a-96c1-9c027394607a
  JuliaSyntaxHighlighting ac6e5ff7-fb65-4e79-a425-ec3bc9c03011
  Example d359f271-ef68-451f-b4fc-6b43e571086c
  Base64 2a0f44e3-6c83-55bd-87e4-b1978d98bd5f
  Example 7876af07-990d-54b4-ab0e-23690620f79a
  StyledStrings f489334b-da3d-4c2e-b8f0-e476e12c162b
  SimplePackage fc6b7c0f-8a2f-4256-bbf4-8c72c30df5be
┌ Warning: The project dependencies or compat requirements have changed since the manifest was last resolved.
│ It is recommended to `Pkg.resolve()` or consider `Pkg.update()` if necessary.
└ @ Pkg.API ~/work/Pkg.jl/Pkg.jl/src/API.jl:1294