8.9.0

What's Changed

• change release instructions to use -dev by @pzl in #369
• set up 8.9 dev cycle by @pzl in #368
• ETW Threat-Intelligence API Event metrics by @jdu2600 in #370
• Fix mapping error by replacing string with keyword by @kevinlog in #373
• 8.9 changelog by @kevinlog in #374
• Release 8.9 Endpoint package by @kevinlog in #375

Full Changelog: v8.8.0...v8.9.0