.NET: Bump Azure.Identity from 1.19.0 to 1.20.0#5103

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dependabot/nuget/dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/Azure.Identity-1.20.0microsoft/agent-framework:dependabot/nuget/dotnet/samples/02-agents/AgentWithRAG/AgentWithRAG_Step05_Neo4jGraphRAG/Azure.Identity-1.20.0Copy head branch name to clipboard