v12.0.0-alpha.6

What's Changed

• fix: "Multiple Podfiles were found" due to vendor inclusion by @robhogan in #1988
• fix: doclinks should not select a default platform by @blakef in #1882
• Update Metro dependencies to 0.76.7 by @robhogan in #1991

Full Changelog: v12.0.0-alpha.5...v12.0.0-alpha.6