Bump Azure.Core (#42648)

Bumps the dotnet group in /docs/azure/sdk/snippets/unit-testing with 1 update: [Azure.Core](https://github.com/Azure/azure-sdk-for-net).


Updates `Azure.Core` from 1.42.0 to 1.43.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Core_1.42.0...Azure.Core_1.43.0)

---
updated-dependencies:
- dependency-name: Azure.Core
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/azure/sdk/snippets/unit-testing/UnitTestingSampleApp.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Core" Version="1.42.0" />
+    <PackageReference Include="Azure.Core" Version="1.43.0" />
     <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="Moq" Version="[4.20.72]" /> <!-- Context: https://github.com/Azure/azure-sdk-for-net/issues/38111 -->