upgrade MySqlConnector nuget package.

src/DotNetCore.CAP.MySql/DotNetCore.CAP.MySql.csproj

@@ -17,7 +17,7 @@
     <PackageReference Include="Dapper" Version="1.50.4" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.2" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Relational" Version="2.0.2" />
-    <PackageReference Include="MySqlConnector" Version="0.38.0" />
+    <PackageReference Include="MySqlConnector" Version="0.40.3" />
   </ItemGroup>
 
   <ItemGroup>

test/DotNetCore.CAP.MySql.Test/DotNetCore.CAP.MySql.Test.csproj

@@ -16,7 +16,7 @@
   <ItemGroup>
     <PackageReference Include="Dapper" Version="1.50.4" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.6.2" />
-    <PackageReference Include="MySqlConnector" Version="0.38.0" />
+    <PackageReference Include="MySqlConnector" Version="0.40.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.3.1" />
     <PackageReference Include="xunit" Version="2.3.1" />
     <PackageReference Include="Microsoft.AspNetCore.Http" Version="2.0.2" />