chore: Bump sshd-docker image from 1.3.0 to 1.4.0

[HofmeisterAn]

See: #1708 (was merged into the wrong branch).

Summary by CodeRabbit

• Chores
  • Updated SSH daemon image to version 1.4.0.

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[coderabbitai]

Walkthrough

The SshdImage constant in PortForwardingContainer.PortForwardingBuilder is updated from testcontainers/sshd:1.3.0 to testcontainers/sshd:1.4.0 with a new SHA256 digest. No other logic, APIs, or control flow is changed.

Changes

SSHD Image Version Bump

Layer / File(s)	Summary
SshdImage constant update src/Testcontainers/Containers/PortForwarding.cs	SshdImage constant updated from testcontainers/sshd:1.3.0@sha256:... to testcontainers/sshd:1.4.0@sha256:bdae17f702908bee93c877ab3e97eddd782e2fb5bdd23a9f29869b9a87b30acd.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

A bunny hops through versions with glee,
From one-point-three to one-point-four, you see!
The sshd image gets a brand new hash,
A single line changed in a flash.
🐇 Version bumps are the easiest cheer!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is incomplete. While it references the related PR #1708, it lacks mandatory sections: detailed explanation of WHAT was changed and WHY it's important.	Add 'What does this PR do?' and 'Why is it important?' sections with detailed explanations of the version bump and its rationale or benefits.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The PR title clearly and accurately describes the main change: bumping the sshd-docker image from version 1.3.0 to 1.4.0, which matches the only modification in the changeset.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch bump/sshd-docker-1.4.0-clean

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/Testcontainers/Containers/PortForwarding.cs`:
- Line 64: The SshdImage constant uses testcontainers/sshd:1.4.0, which is an
undocumented version without official release notes or GitHub tags. The latest
documented release is version 1.3.0. Either revert the SshdImage constant back
to version 1.3.0, or if 1.4.0 must be used, provide a technical justification
comment explaining why this undocumented version is necessary and add test cases
to verify that port forwarding functionality continues to work correctly with
the new image version.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: c8606610-2325-4ab3-958f-3f93d6fc708f

📥 Commits

Reviewing files that changed from the base of the PR and between 638a926 and 625451b.

📒 Files selected for processing (1)

• src/Testcontainers/Containers/PortForwarding.cs