Bump the dotnet group with 2 updates

Bumps Azure.Identity from 1.13.2 to 1.14.0
Bumps Azure.Security.KeyVault.Secrets from 4.7.0 to 4.8.0

---
updated-dependencies:
- dependency-name: Azure.Identity
  dependency-version: 1.14.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: dotnet
- 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/configure-proxy/ProxyServerConfiguration.csproj

@@ -8,8 +8,8 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Azure.Identity" Version="1.13.2" />
-    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.7.0" />
+    <PackageReference Include="Azure.Identity" Version="1.14.0" />
+    <PackageReference Include="Azure.Security.KeyVault.Secrets" Version="4.8.0" />
   </ItemGroup>
 
 </Project>