Bump coverlet.collector to 6.0.4#9

dependabot[bot] wants to merge 1 commit intomainastar-development/astar-dev-testing-dashboard:mainfrom

dependabot/nuget/test/AStar.Dev.Testing.Dashboard.Server.Tests.Unit/multi-c50dbe7753astar-development/astar-dev-testing-dashboard:dependabot/nuget/test/AStar.Dev.Testing.Dashboard.Server.Tests.Unit/multi-c50dbe7753Copy head branch name to clipboard