windows: upgrade .cosign signature to .sigstore ("new bundle" format)
#494
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The suffix is entirely arbitrary on my part. I could find no mention of
what this should be, and it's also brand new, with no clear practice or
convention I could find.
Anyway, the content of the
.sigstorefile is the "new bundle" format,which allows offline verification.
It has been released in full last month by cosign and made the default
in yesterday's release (3.0.1). It's also the officially recommanded
format. This was preceded by a slipped out 3.0.0 release 2 days ago,
triggering a quick fix downstream in curl-for-win.
Ref: curl/curl-for-win@aaf54db
Docs page not yet updated: https://docs.sigstore.dev/about/bundle/
Pending PR: sigstore/docs#385