Revert System.Memory

Author: CurtHagenlocher

csharp/src/Apache.Arrow/Apache.Arrow.csproj

@@ -12,11 +12,11 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(TargetFrameworkIdentifier)' == '.NETStandard' or '$(TargetFramework)' == 'net462'">
-    <PackageReference Include="System.Buffers" Version="4.6.1" />
-    <PackageReference Include="System.Memory" Version="4.6.3" />
-    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.2" />
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.3" />
-    <PackageReference Include="System.ValueTuple" Version="4.6.1" />
+    <PackageReference Include="System.Buffers" Version="4.6.0" />
+    <PackageReference Include="System.Memory" Version="4.6.0" />
+    <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.0" />
+    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.6.0" />
+    <PackageReference Include="System.ValueTuple" Version="4.5.0" />
   </ItemGroup>
 
   <ItemGroup>