fix(typst): proper array syntax for bibliography

[mcanouil]

Correct the syntax for specifying multiple bibliography files in the Typst template. This change resolves an issue where the previous syntax caused errors during document rendering with Typst.

Fixes #13602

A PR upstream was also made, thus why src/resources/formats/typst/pandoc/typst.template is not modified here, but it could be:

• fix(templates/default.typst): wrong syntax for bibliography inclusion jgm/pandoc#11233

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[cderv]

Looks good.

I'll add a test and a news items. They usually should be in all PR.

[mcanouil]

Thanks for the test. Maybe add one (I can also but as you are on the branch, i'd rather avoid conflict) when using bibliography: references.bib.

[cderv]

I rebased for cleaner history, and I'll merge when tests passes. Thank you !