optimize hit rate analysis (#646)

Author: bitfaster

BitFaster.Caching.HitRateAnalysis/BitFaster.Caching.HitRateAnalysis.csproj

@@ -2,7 +2,10 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
+    <ServerGarbageCollection>true</ServerGarbageCollection>
+    <ConcurrentGarbageCollection>true</ConcurrentGarbageCollection>
+    <RetainVMGarbageCollection>true</RetainVMGarbageCollection>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">