Update dependency Azure.Identity to 1.20.0

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup Label="Versions for direct package references">
     <PackageVersion Include="Autofac" Version="9.0.0" />
     <PackageVersion Include="AWSSDK.CloudWatch" Version="4.0.7" />
-    <PackageVersion Include="Azure.Identity" Version="1.19.0" />
+    <PackageVersion Include="Azure.Identity" Version="1.20.0" />
     <PackageVersion Include="Azure.Monitor.Query.Metrics" Version="1.0.0" />
     <PackageVersion Include="Azure.ResourceManager.ServiceBus" Version="1.1.0" />
     <PackageVersion Include="ByteSize" Version="2.1.2" />