update swc_ecma_transforms_proposal to v0.167.15

[tjjfvi]

This version fixes swc-project/swc#8020, which currently causes incorrect ReferenceErrors in Deno:

// foo.ts

using foo = null

const bar = 1

console.log(baz()) // should log `1`

function baz() {
  return bar
}

$ deno run foo.ts
error: Uncaught ReferenceError: bar is not defined
  return bar
  ^
    at baz (file://.../foo.ts:8:3)
    at file://.../foo.ts:5:13

[dsherret]

I'm going to do it tomorrow probably. There were a bunch of other fixes that have landed now.