Bump System.Runtime.Caching from 8.0.1 to 9.0.4

Bumps [System.Runtime.Caching](https://github.com/dotnet/runtime) from 8.0.1 to 9.0.4.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v8.0.1...v9.0.4)

---
updated-dependencies:
- dependency-name: System.Runtime.Caching
  dependency-version: 9.0.4
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

BitFaster.Caching.Benchmarks/BitFaster.Caching.Benchmarks.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
@@ -27,7 +27,7 @@
     <PackageReference Include="BenchmarkDotNet.Diagnostics.Windows" Version="0.14.0" />
     <PackageReference Include="MathNet.Numerics" Version="5.0.0" />
     <PackageReference Include="Microsoft.Extensions.Caching.Memory" Version="9.0.2" />
-    <PackageReference Include="System.Runtime.Caching" Version="8.0.1" />
+    <PackageReference Include="System.Runtime.Caching" Version="9.0.4" />
   </ItemGroup>
 
   <ItemGroup>