test(deps): update swift docker tag to v6.4.0 (main)

[renovate]

This PR contains the following updates:

Package	Update	Change
swift (source)	minor	6.3.3 → 6.4.0

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Configuration used: defaults

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📥 Commits

Reviewing files that changed from the base of the PR and between 983399c and f937585.

📒 Files selected for processing (3)

• test/Dockerfile.distro
• test/swift/Dockerfile
• test/swift/Dockerfile.arm64

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📝 Walkthrough

Walkthrough

The test Dockerfiles now specify Swift 6.4.0 instead of Swift 6.3.3. Swift installation remains skipped on Resolute in the distro Dockerfile.

Changes

Swift version update

Layer / File(s)	Summary
Update Swift versions test/Dockerfile.distro, test/swift/Dockerfile, test/swift/Dockerfile.arm64	The distro default and both Swift test images now use Swift 6.4.0 instead of Swift 6.3.3.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~3 minutes

Change: Other

Merge Risk: ⚪ Minimal · up to f9375

The test images now use Swift 6.4.0 across the distro, amd64, and arm64 paths, with no identified platform mismatch. No actionable merge-blocking risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: updating the Swift Docker tag to version 6.4.0 in the main branch test dependencies.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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.

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