chore: bump sigs.k8s.io/structured-merge-diff/v6 from 6.4.0 to 6.4.2

[dependabot]

Bumps sigs.k8s.io/structured-merge-diff/v6 from 6.4.0 to 6.4.2.

Commits

• 15d0754 Merge pull request #334 from jpbetz/revert-306-master
• f23ab84 Revert #306, keep Nullable schema field
• 281daba Merge pull request #332 from jpbetz/nullable-empty-container-preservation
• d28d362 Add nullable type support
• e570f92 Merge pull request #328 from lalitc375/fix-deserailezed-tests
• ba35bbd Address feedbacks
• 3001c6e Harden path element deserialization trailing data validation
• 3ce9bc1 Add edge-case tests for DeserializePathElement
• 2ad5e4f Merge pull request #326 from benluddy/unstructured-converter-with-error
• f772c7a Add value.UnstructuredConverter sibling interface that can fail.
• Additional commits viewable in compare view

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