Bump Azure.Identity from 1.17.1 to 1.18.0 (#884)

Updated [Azure.Identity](https://github.com/Azure/azure-sdk-for-net)
from 1.17.1 to 1.18.0.

<details>
<summary>Release notes</summary>

_Sourced from [Azure.Identity's
releases](https://github.com/Azure/azure-sdk-for-net/releases)._

## 1.18.0

## 1.18.0 (2026-02-25)

### Features Added

- Added experimental `Microsoft.Extensions.Configuration` and
`Microsoft.Extensions.DependencyInjection` integration for Azure SDK
clients. For details, see the [Configuration and Dependency
Injection](https://github.com/Azure/azure-sdk-for-net/blob/release/Azure.Identity_1.18.0/sdk/core/Azure.Core/src/docs/ConfigurationAndDependencyInjection.md)
documentation.

- The `WorkloadIdentityCredentialOptions.IsAzureProxyEnabled` property,
which enables Azure Kubernetes token proxy mode, is only available in
beta releases of this package.

- `AzureDeveloperCliCredential` now parses JSON error output from `azd
auth token` to extract clean error messages instead of including raw
JSON in exceptions. Error messages like
`{"type":"consoleMessage","data":{"message":"ERROR: fetching token:
..."}}` are now displayed as `ERROR: fetching token: ...`.


## 1.18.0-beta.3

## 1.18.0-beta.3 (2026-02-20)

### Breaking Changes

- Renamed
`WorkloadIdentityCredentialOptions.IsAzureKubernetesTokenProxyEnabled`
to `IsAzureProxyEnabled` to follow .NET naming conventions for boolean
properties.

### Bugs Fixed

- Fixed a NullReferenceException that occurred during X509Chain
validation on Linux when using the Identity Bindings feature.

- Disabled MSAL's internal retry logic for
`ConfidentialClientApplication` and `PublicClientApplication` to prevent
double retries when combined with Azure SDK's retry policy. Only the
configured Azure SDK retry policy is applied, avoiding unexpected
additional retry attempts.


Commits viewable in [compare
view](https://github.com/Azure/azure-sdk-for-net/commits/Azure.Identity_1.18.0).
</details>

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Directory.Packages.props

@@ -18,7 +18,7 @@
   <ItemGroup>
     <PackageVersion Include="AspNet.Security.OAuth.GitHub" Version="10.0.0" />
     <PackageVersion Include="Azure.Extensions.AspNetCore.Configuration.Secrets" Version="1.4.0" />
-    <PackageVersion Include="Azure.Identity" Version="1.17.1" />
+    <PackageVersion Include="Azure.Identity" Version="1.18.0" />
     <PackageVersion Include="Azure.Monitor.OpenTelemetry.AspNetCore" Version="1.4.0" />
     <PackageVersion Include="Microsoft.ApplicationInsights.Profiler.AspNetCore" Version="3.0.1" />
     <PackageVersion Include="TUnit" Version="1.17.29" />