Bump Testcontainers.MySql from 3.8.0 to 4.0.0

Bumps [Testcontainers.MySql](https://github.com/testcontainers/testcontainers-dotnet) from 3.8.0 to 4.0.0.
- [Release notes](https://github.com/testcontainers/testcontainers-dotnet/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-dotnet/blob/develop/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-dotnet@3.8.0...4.0.0)

---
updated-dependencies:
- dependency-name: Testcontainers.MySql
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

tests/Directory.Packages.props

@@ -10,7 +10,7 @@
     <PackageVersion Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.4" />
     <PackageVersion Include="Testcontainers.Kafka" Version="3.8.0" />
     <PackageVersion Include="Testcontainers.MsSql" Version="3.8.0" />
-    <PackageVersion Include="Testcontainers.MySql" Version="3.8.0" />
+    <PackageVersion Include="Testcontainers.MySql" Version="4.0.0" />
     <PackageVersion Include="Testcontainers.PostgreSql" Version="3.8.0" />
     <PackageVersion Include="xunit" Version="2.9.0" />
     <PackageVersion Include="xunit.assert" Version="2.9.0" />