Update dependency MySql.Data to 9.4.0 (#1783)

Co-authored-by: dependencyupdates[bot] <218638057+dependencyupdates[bot]@users.noreply.github.com>

Author: dependencyupdates[bot]

src/TestHelper/TestHelper.csproj

@@ -8,7 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.Data.SqlClient" Version="6.1.1" />
-    <PackageReference Include="MySql.Data" Version="9.3.0" />
+    <PackageReference Include="MySql.Data" Version="9.4.0" />
     <PackageReference Include="Npgsql" Version="9.0.3" />
     <PackageReference Include="NUnit" Version="4.4.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.10.0" />