Correct container_py_toolchain target

[robin-wayve]

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

Docs point to a target that has since moved.

What is the new behavior?

Docs point to the new target.

Does this PR introduce a breaking change?

• Yes
• No

Other information

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[robin-wayve]

@googlebot I signed it!

[alexeagle]

thanks!