CSHARP-3489: Update libmongocrypt nuget reference on 1.2.1 version. (#475)

Author: DmitryLukyanov

src/MongoDB.Driver.Core/MongoDB.Driver.Core.csproj

@@ -126,7 +126,7 @@
   <ItemGroup>
     <PackageReference Include="DnsClient" Version="1.4.0" />
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.2" PrivateAssets="All" />
-    <PackageReference Include="MongoDB.Libmongocrypt" Version="1.2.0" />
+    <PackageReference Include="MongoDB.Libmongocrypt" Version="1.2.1" />
     <PackageReference Include="SharpCompress" Version="0.23.0" />
     <PackageReference Include="System.Buffers" Version="4.5.1" />
   </ItemGroup>

src/MongoDB.Driver/MongoDB.Driver.csproj

@@ -50,7 +50,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.CodeAnalysis.FxCopAnalyzers" Version="2.6.2" PrivateAssets="All" />
-    <PackageReference Include="MongoDB.Libmongocrypt" Version="1.2.0" />
+    <PackageReference Include="MongoDB.Libmongocrypt" Version="1.2.1" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == 'netstandard1.5'">