Bump Azure.Security.KeyVault.Keys from 4.8.0 to 4.9.0 (#323)

Updated
[Azure.Security.KeyVault.Keys](https://github.com/Azure/azure-sdk-for-net)
from 4.8.0 to 4.9.0.

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

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

## 4.9.0

## 4.9.0 (2026-02-25)

### Features Added

- Added `SecretClientSettings` to support creating a `SecretClient` from
`IConfiguration`, including configuration-based credential resolution
and dependency injection registration.
- Added the `outContentType` query parameter to the
`SecretClient.GetSecret` and `SecretClient.GetSecretAsync` to specify
the format in which the certificate will be returned.
- Added the `previousVersion` property to `SecretProperties`.

### Other Changes

- The default service version is now `2025-07-01`.


Commits viewable in [compare
view](https://github.com/Azure/azure-sdk-for-net/commits/Azure.Security.KeyVault.Secrets_4.9.0).
</details>

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Directory.Packages.props

@@ -4,7 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageVersion Include="Azure.Identity" Version="1.17.1" />
-    <PackageVersion Include="Azure.Security.KeyVault.Keys" Version="4.8.0" />
+    <PackageVersion Include="Azure.Security.KeyVault.Keys" Version="4.9.0" />
     <PackageVersion Include="Serde" Version="0.10.2" />
     <PackageVersion Include="Serde.CmdLine" Version="0.1.3" />
     <PackageVersion Include="Spectre.Console" Version="0.54.0" />