Update MDA to 0.18.0 (#977)

Author: pgovind

src/csharp/Microsoft.Spark.UnitTest/Microsoft.Spark.UnitTest.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Moq" Version="4.10.0" />
-    <PackageReference Include="System.Memory" Version="4.5.2" />
+    <PackageReference Include="System.Memory" Version="4.5.3" />
   </ItemGroup>
 
   <ItemGroup>

src/csharp/Microsoft.Spark.Worker/Microsoft.Spark.Worker.csproj

@@ -14,7 +14,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.DotNet.DependencyManager" Version="10.10.0-beta.20254.4" />
-    <PackageReference Include="System.Memory" Version="4.5.2" />
+    <PackageReference Include="System.Memory" Version="4.5.3" />
   </ItemGroup>
 
   <ItemGroup Condition=" '$(TargetFramework)' == 'netcoreapp3.1' ">

src/csharp/Microsoft.Spark/Microsoft.Spark.csproj

@@ -30,10 +30,10 @@
   <ItemGroup>
     <PackageReference Include="Apache.Arrow" Version="2.0.0" />
     <PackageReference Include="Microsoft.CSharp" Version="4.5.0" />
-    <PackageReference Include="Microsoft.Data.Analysis" Version="0.4.0" />
+    <PackageReference Include="Microsoft.Data.Analysis" Version="0.18.0" />
     <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
     <PackageReference Include="Razorvine.Pyrolite" Version="4.26.0" />
-    <PackageReference Include="System.Memory" Version="4.5.2" />
+    <PackageReference Include="System.Memory" Version="4.5.3" />
   </ItemGroup>
 
   <ItemGroup>