validate package (#343)

* validate

* rem bckup

* suppress

---------

Author: bitfaster

BitFaster.Caching/BitFaster.Caching.csproj

@@ -25,6 +25,11 @@
     <FileVersion>2.1.3.0</FileVersion>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
+    <!--Package Validation-->
+    <EnablePackageValidation>true</EnablePackageValidation>
+    <PackageValidationBaselineVersion>2.1.3</PackageValidationBaselineVersion>
+    <!--FastConcurrentTLru/ConcurrentTLru have illegal base type switching -->
+    <NoWarn >$(NoWarn);CP0007</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(GITHUB_ACTIONS)' == 'true'">