Bump System.Buffers from 4.5.1 to 4.6.0

Bumps [System.Buffers](https://github.com/dotnet/maintenance-packages) from 4.5.1 to 4.6.0.
- [Release notes](https://github.com/dotnet/maintenance-packages/releases)
- [Commits](https://github.com/dotnet/maintenance-packages/commits)

---
updated-dependencies:
- dependency-name: System.Buffers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Directory.Packages.props

@@ -5,7 +5,7 @@
         <PackageVersion Include="coverlet.collector" Version="6.0.2" />
         <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.0" />
         <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-        <PackageVersion Include="System.Buffers" Version="4.5.1" />
+        <PackageVersion Include="System.Buffers" Version="4.6.0" />
         <PackageVersion Include="System.Memory" Version="4.5.5" />
         <PackageVersion Include="System.Collections.Immutable" Version="1.2.0" />
         <PackageVersion Include="System.Runtime.CompilerServices.Unsafe" Version="6.0.0" />