Bump the dotnet group with 1 update

Bumps Azure.Security.KeyVault.Secrets from 4.7.0 to 4.8.0

---
updated-dependencies:
- dependency-name: Azure.Security.KeyVault.Secrets
  dependency-version: 4.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
...

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

Author: dependabot[bot]

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

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Azure.Core" Version="1.46.2" />
-    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.7.0" />
+    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.8.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
     <PackageReference Include="Moq" Version="[4.20.72]" /> <!-- Context: https://github.com/Azure/azure-sdk-for-net/issues/38111 -->
     <PackageReference Include="NSubstitute" Version="5.3.0" />