1.9.0

What's Changed

• gomod: bump github.com/slack-go/slack from 0.12.1 to 0.12.2 by @dependabot in #74
• docker: bump golang from 1.20.3-alpine to 1.20.4-alpine by @dependabot in #75
• docker: bump golang from 1.20.4-alpine to 1.20.5-alpine by @dependabot in #76
• docker: bump golang from 1.20.5-alpine to 1.20.6-alpine by @dependabot in #77
• docker: bump golang from 1.20.6-alpine to 1.20.7-alpine by @dependabot in #78
• docker: bump golang from 1.20.7-alpine to 1.21.0-alpine by @dependabot in #79
• Sync dependabot configuration by @benmatselby in #80
• gomod: bump github.com/slack-go/slack from 0.12.2 to 0.12.3 by @dependabot in #81
• Sync dependabot configuration by @benmatselby in #82
• Bump the go version to 1.21 by @benmatselby in #84
• Uplift the repo a little in terms of linting by @benmatselby in #85
• Document the 1.9.0 release by @benmatselby in #86

Full Changelog: v1.8.0...v1.9.0