fix: sources_content should be Vec<Option<Arc<str>>>

[IWANABETHATGUY]

1. related to [Bug]: sourcesContent should be null rolldown/rolldown#4327
2. Rollup sourcemap.sources_content type is null | string, however it is Arc<str> in oxc_sourcemap,
   see also
   https://github.com/rollup/rollup/blob/061a0387c8654222620f602471d66afd3c582048/src/utils/collapseSourcemaps.ts?plain=1#L197
   https://github.com/getsentry/rust-sourcemap/blob/master/src/types.rs#L468
   https://github.com/getsentry/rust-sourcemap/blob/f946f5a581c598c8a89dfd076eb39d5867ba3955/src/builder.rs#L30

[IWANABETHATGUY]

• fix: sources_content should be Vec<Option<Arc<str>>> #50 👈 (View in Graphite)
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