Mewline v1.4.1

What's Changed

• Bump actions/cache from 4 to 5 by @dependabot[bot] in #9
• Bump actions/checkout from 5 to 6 by @dependabot[bot] in #8
• fix(notifications): normalize urgency type (fixes #10)

Full Changelog: v1.4.0...v1.4.1