jsonargparse, please move away from toml to tomli_w

[LocutusOfBorg]

Hello, from https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1144104

I'm tracking the usage of obsolete "toml" lib.

It has already be largely replaced by "tomli".

And "tomli" has been integrated into the Python Standard Library since 3.10 (3.11?)
under the name "tomllib".

But the trick is that only the reading part has been integrated, not the writing part.

For the writing part there is python3-tomli-w.

I guess python3-toml will still remain for a few years;
but it's better to give upstream a headsup well in advance.

[mauvilsa]

@LocutusOfBorg thank you for reporting! Indeed tomllib is already used for reading when available, otherwise toml is used. I will have a look at migrating away from toml.

[LocutusOfBorg]

If toml is just used as fallback, we can already close this bug!

[mauvilsa]

In Python 3.10 toml is needed to read, and also toml write is needed, so having this open for a switch to tomli-w is good.

[LocutusOfBorg]

Oh I didn't check if you were using it for writing, thanks for fixing it then!