Update dependency Microsoft.Identity.Web to v2.12.4 (#460)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[Microsoft.Identity.Web](https://togithub.com/AzureAD/microsoft-identity-web)
| nuget | patch | `2.12.2` -> `2.12.4` |

---

### Release Notes

<details>
<summary>AzureAD/microsoft-identity-web</summary>

###
[`v2.12.4`](https://togithub.com/AzureAD/microsoft-identity-web/releases/tag/2.12.4)

# 2.12.4

-   fix for CVE-2023-29331 in `System.Security.Cryptography.Pkcs`

</details>

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Directory.Packages.props

@@ -21,7 +21,7 @@
     <PackageVersion Include="Microsoft.Extensions.Configuration.Binder" Version="8.0.0-preview.5.23280.8"/>
     <PackageVersion Include="Microsoft.Extensions.DependencyModel" Version="8.0.0-preview.5.23280.8"/>
     <PackageVersion Include="Microsoft.Identity.Client.Extensions.Msal" Version="2.31.0" />
-    <PackageVersion Include="Microsoft.Identity.Web" Version="2.12.2" />
+    <PackageVersion Include="Microsoft.Identity.Web" Version="2.12.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.6.2" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="1.1.1" />
     <PackageVersion Include="Newtonsoft.Json" Version="13.0.3" />