Use System.Threading.Lock in ConcurrentLfu (#697)

Author: bitfaster

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

@@ -3,7 +3,7 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <LangVersion>latest</LangVersion>
-    <TargetFrameworks>net6.0;net8.0</TargetFrameworks>
+    <TargetFrameworks>net6.0;net8.0;net9.0</TargetFrameworks>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <!-- https://stackoverflow.com/a/59916801/131345 -->
     <IsWindows Condition="'$([System.Runtime.InteropServices.RuntimeInformation]::IsOSPlatform($([System.Runtime.InteropServices.OSPlatform]::Windows)))' == 'true'">true</IsWindows> 

BitFaster.Caching/BitFaster.Caching.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <TargetFrameworks>netstandard2.0;netcoreapp3.1;net6.0;net9.0</TargetFrameworks>
-    <LangVersion>11.0</LangVersion>
+    <LangVersion>13.0</LangVersion>
     <Authors>Alex Peck</Authors>
     <Company />
     <Product>BitFaster.Caching</Product>
@@ -30,7 +30,7 @@
     <Nullable>enable</Nullable>
     <!--Package Validation-->
     <EnablePackageValidation>true</EnablePackageValidation>
-    <PackageValidationBaselineVersion>2.5.3</PackageValidationBaselineVersion>    
+    <PackageValidationBaselineVersion>2.5.4</PackageValidationBaselineVersion>    
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">