@slack/bolt@3.12.0

• Fix #1507 Add type support for message_metadata_* event types (via #1508) - thanks @dannyhostetler!
• Allow passing additional types for Global and Middleware Context (via #1505) - thanks @M1kep!
• Fix #1510: Add isEnterpriseInstall to Context (via #1511) - thanks @rockingskier!
• Fix #1052: Request verification failed: Failed to verify authenticity: stale (via #1503) - thanks @srajiang!
• Fixed receiver warning typo (via #1492) - thanks @nick-w-nick!

Here is the list of all the issues / pull requests included in the release: https://github.com/slackapi/bolt-js/milestone/21?closed=1