chore(turbopack): Update `swc_core` to `v0.76.6` (#49792)
### What?
Updates `swc_core` to `v0.76.x`, which adds support for `Explicit Resource Management` (stage 3)
### Why?
It's stage 3
### How?
Closes WEB-1040
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turbopack counterpart: https://github.com/vercel/turbo/pull/4937
Co-authored-by: Tobias Koppers <1365881+sokra@users.noreply.github.com>
