chore(deps): update dependency @patternfly/documentation-framework to ^6.31.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Confidence
@​patternfly/documentation-framework	^6.28.9 -> ^6.31.15

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✨ Finishing touches

🧪 Generate unit tests (beta)

• [ ] Create PR with unit tests
• [ ] Post copyable unit tests in a comment
• [ ] Commit unit tests in branch renovate/patternfly-documentation-framework-6.x

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[patternfly-build]

Preview: https://pf-react-pr-12170.surge.sh

A11y report: https://pf-react-pr-12170-a11y.surge.sh