Update dependency Azure.Identity to 1.15.0

Author: dependencyupdates[bot]

src/tests/Tests.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Data.Tables" Version="12.8.3" />
-    <PackageReference Include="Azure.Identity" Version="1.11.4" />
+    <PackageReference Include="Azure.Identity" Version="1.15.0" />
     <PackageReference Include="Azure.Storage.Blobs" Version="12.20.0" />
     <PackageReference Include="Azure.Storage.Queues" Version="12.18.0" />
     <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1" />