v1.4.2

This is a small release consisting of documentation updates and dead code cleanup.

What's Changed

General

• [TUF] Add dates for rollout to beta and stable by @RebeccaMahany in #1538
• Update version of golang in documentation by @RebeccaMahany in #1539
• [TUF] Update risk mitigation steps for TUF rollout by @RebeccaMahany in #1540
• Remove some unused code by @RebeccaMahany in #1541

Full Changelog: v1.4.1...v1.4.2