chore: Use new sshd:1.2.0 image

[mdelapenya]

What does this PR do?

It uses the newest testcontainers/sshd:1.2.0 docker image, which includes the CMD in the image instead of in the code.

Please see https://github.com/testcontainers/sshd-docker/pull/7 for more details.

Why is it important?

Avoid code duplication across testcontainers projects.

Related issues

• Caused by https://github.com/testcontainers/sshd-docker/pull/7
• Relates (java) https://github.com/testcontainers/testcontainers-java/pull/8574
• Relates (node) https://github.com/testcontainers/testcontainers-node/pull/758
• Relates (go) https://github.com/testcontainers/testcontainers-go/pull/2471/commits/8f8a7c2a05854614ea20f040fe98aa26d9698d4f

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