Update testcontainers-scala to 0.38.4

[scala-steward]

Updates com.dimafeng:testcontainers-scala from 0.37.0 to 0.38.4.

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "com.dimafeng", artifactId = "testcontainers-scala" } ]

labels: library-update, semver-minor