update TOML from upstream library #47448
Merged
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Parts of the TOML library is split between Base and the stdlib because the parser is needed in Base for package loading. Development typically tends to happen in https://github.com/JuliaLang/TOML.jl though. As @DilumAluthge have suggested, we should probably archive the external repo and make all TOML work in the Julia repo since splitting the development into two places is error prone.
The main thing this PR does is to change the testing from checking in the test files to using an external repo to download the test files from. This significantly reduces the number of test files we ship with Julia. There are also some small bug fixes in there.
Closes #46454