Bump System.Runtime.Caching from 8.0.1 to 9.0.8

---
updated-dependencies:
- dependency-name: System.Runtime.Caching
  dependency-version: 9.0.8
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

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

@@ -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="9.0.8" />
   </ItemGroup>
 
   <ItemGroup>