chore(deps): update dependency mysqlconnector to v2

Author: renovate[bot]

src/NHibernate.Driver.MySqlConnector/NHibernate.Driver.MySqlConnector.csproj

@@ -23,7 +23,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="MySqlConnector" Version="1.0.0"/>
+    <PackageReference Include="MySqlConnector" Version="2.3.7"/>
     <PackageReference Include="NHibernate" Version="5.4.9"/>
   </ItemGroup>