chore(deps): update dependency webpack-merge to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webpack-merge	5.10.0 -> 6.0.1

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Release Notes

survivejs/webpack-merge (webpack-merge)

v6.0.1

Compare Source

• Fix - Restore usage of clone-deep as there was a corner case where structuredClone did not work as expected. #​214

v6.0.0

Compare Source

• Chore - Update internal dependencies. As a result, the package needs at least Node 18 to run.
• Chore - Use structuredClone over clone-deep dependency since it is included to Node 18 or above. #​214

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[chenjiahan]

Can be merged as the structuredClone PR has been reverted.