fix: repoint flatbuffers lockfile URLs to registry.npmjs.org (#436)

Two flatbuffers entries resolved to npm-proxy.dev.databricks.com, a dev-only
proxy unreachable from the protected release/CI runners. npm rewrites
registry.npmjs.org hosts to the configured JFrog db-npm registry but leaves
other hosts as-is, so 'npm clean-install' in the release build died with
ECONNRESET fetching flatbuffers. Repoint to registry.npmjs.org (integrity
unchanged — same tarball). Fixes the release build for RC and GA alike.

Co-authored-by: Isaac

Signed-off-by: Madhavendra Rathore <madhavendra.rathore@databricks.com>

Author: msrathore-db