Bump Azure.Extensions.AspNetCore.DataProtection.Keys from 1.6.3 to 1.6.4 (#1303)

Updated
[Azure.Extensions.AspNetCore.DataProtection.Keys](https://github.com/Azure/azure-sdk-for-net)
from 1.6.3 to 1.6.4.

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

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

## 1.6.4

## 1.6.4 (2026-09-08)

### Other Changes

- Updated `Azure.Core` dependency from 1.55.0 to 1.61.0.
- Updated `Microsoft.AspNetCore.DataProtection` to patched versions that
resolve `System.Security.Cryptography.Xml` advisories
GHSA-g8r8-53c2-pm3f, GHSA-8q5v-6pqq-x66h, GHSA-23rf-6693-g89p,
GHSA-cvvh-rhrc-wg4q, and GHSA-mmjf-rqrv-855v: from 8.0.26 to 8.0.29 for
`net8.0`, and from 10.0.7 to 10.0.10 for all other target frameworks.


Commits viewable in [compare
view](https://github.com/Azure/azure-sdk-for-net/commits/Azure.Extensions.AspNetCore.DataProtection.Keys_1.6.4).
</details>

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Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="ContentFeedNuget" Version="$(ToolingPackagesVersion)" />
   </ItemGroup>
   <ItemGroup>
-    <PackageVersion Include="Azure.Extensions.AspNetCore.DataProtection.Keys" Version="1.6.3" />
+    <PackageVersion Include="Azure.Extensions.AspNetCore.DataProtection.Keys" Version="1.6.4" />
     <PackageVersion Include="Microsoft.AspNetCore.DataProtection.EntityFrameworkCore" Version="10.0.11" />
     <PackageVersion Include="AspNet.Security.OAuth.GitHub" Version="10.0.0" />
     <PackageVersion Include="Azure.Extensions.AspNetCore.Configuration.Secrets" Version="1.5.1" />