Bump the dotnet group

Bumps the dotnet group in /docs/azure/sdk/snippets/unit-testing with 2 updates: [Azure.Core](https://github.com/Azure/azure-sdk-for-net) and [Azure.Security.KeyVault.Secrets](https://github.com/Azure/azure-sdk-for-net).


Updates `Azure.Core` from 1.44.0 to 1.44.1
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Core_1.44.0...Azure.Core_1.44.1)

Updates `Azure.Security.KeyVault.Secrets` from 4.6.0 to 4.7.0
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Security.KeyVault.Secrets_4.6.0...Azure.Security.KeyVault.Secrets_4.7.0)

Updates `Azure.Core` from 1.44.0 to 1.44.1
- [Release notes](https://github.com/Azure/azure-sdk-for-net/releases)
- [Commits](Azure/azure-sdk-for-net@Azure.Core_1.44.0...Azure.Core_1.44.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

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

@@ -10,8 +10,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Core" Version="1.44.0" />
-    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.6.0" />
+    <PackageReference Include="Azure.Core" Version="1.44.1" />
+    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.7.0" />
     <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 -->
     <PackageReference Include="NSubstitute" Version="5.1.0" />