deps: Update dependency dotnet-reportgenerator-globaltool to version 5.1.18

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
dotnet-reportgenerator-globaltool	nuget	patch	5.1.17 -> 5.1.18

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Release Notes

danielpalme/ReportGenerator

### [`v5.1.18`](https://togithub.com/danielpalme/ReportGenerator/releases/tag/v5.1.18): ReportGenerator_5.1.18 This release requires .NET 4.7 or .NET Core 3.1/5.x/6.x/7.x. ##### Changes: - Fix: [#​590](https://togithub.com/danielpalme/ReportGenerator/issues/590), [#​591](https://togithub.com/danielpalme/ReportGenerator/issues/591): Improved support for Cobertura files generated with `dotnet test --collect "Code Coverage;Format=Cobertura"`

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