Update dependency GraphQL.Server.Ui.Voyager to v5.1.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
GraphQL.Server.Ui.Voyager	nuget	patch	5.1.0 -> 5.1.1

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Release Notes

graphql-dotnet/server

v5.1.1

Compare Source

What's Changed

• Fix content-type bug by @​sungam3r in https://github.com/graphql-dotnet/server/pull/656
• CodeQL support by @​sungam3r in https://github.com/graphql-dotnet/server/pull/662
• Update LICENSE.md by @​sungam3r in https://github.com/graphql-dotnet/server/pull/645

Full Changelog: graphql-dotnet/server@5.1.0...5.1.1

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