Incompatibility with Julia 1.10 due to zombie I/O resources

[MilesCranmer]

x-post comonicon/Comonicon.jl#249 and JuliaLang/julia#50839

It seems like on Julia 1.10, this package is causing precompilation/builds of downstream dependencies to hang. According to Tim Holy, this is due to I/O resources being opened during module definition:

If you open an I/O resource during module definition, you now (Julia 1.10+) have to close it before exiting the module. Example of a fix:

• Close timers in ondestroy JuliaGizmos/GtkObservables.jl#46

• followed by more thorough housecleaning during precompilation: More explicit finalization JuliaGizmos/GtkObservables.jl#47

I can't remember if the 2nd PR was needed to fix precompilation, but I don't think so. But digging turned up more evidence that we were doing a bad job of freeing resources, so responding to the changes in 1.10 made the package better.

Does anything stand out as causing this issue? I'd be happy to submit a PR.

[MilesCranmer]

Should be fixed with #6