Update dependency webpack-merge to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
webpack-merge	^5.0.0 -> ^6.0.0

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Release Notes

survivejs/webpack-merge (webpack-merge)

v6.0.1

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

v6.0.0

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• 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

v5.10.0

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• Feat - Support object/array-formed condition for mergeWithRules. #​212

v5.9.0

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• Feat - Support deep merging when rule is a merge. #​193, #​206

v5.8.0

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• Docs - Update env example to be webpack 5 compatible. #​177, #​180
• Feat - Support strings as rules for TypeScript, not just enums. #​179, #​185

v5.7.3

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• Fix - Don't merge strings with objects in mergeWithRules. #​172

v5.7.2

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• Fix - If there's no match when using merge operation with mergeWithRules, use default merge behavior as a fallback. #​167

v5.7.1

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• Fix - Fix a merge failure for mergeWithRules when non-array matches are merged. #​166

v5.7.0

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• Feat - Throw a TypeError if trying to use mergeWithRules with invalid configuration types for append/prepend/merge operations.

v5.6.1

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• Fix - Drop extraneous logging.

v5.6.0

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• Feat - Support merge (CustomizeRule.Merge) for objects at mergeWithRules. This is useful for merging loader options for example. #​163

v5.5.0

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• Feat - Allow mergeWithRules to merge based on rules without a match. #​151 #​159

v5.4.1

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• Fix - Allow mergeUnique to work with arbitrary order. #​161

v5.4.0

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• Fix - Fall back correctly in mergeWithRules for cases that aren't matched. #​157 #​158
• Fix - Don't throw if using mergeWithRules without a rule #​151
• Feat - Throw if undefined is passed to merge as a structure to merge

v5.3.0

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• Fix - Expose Configuration type through a generic to TypeScript to support both webpack 4 and 5 #​141 #​154

In case you use webpack 4, please change your typing as instructed in the readme as the default type is loose but non-breaking.

v5.2.0

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• Feature - Support advanced merging cases through mergeWithRules #​146 #​149

v5.1.4

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• Fix - Expose CustomizeRule for TypeScript users #​147

v5.1.3

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• Fix - Allow merging a RegExp to itself #​145

v5.1.2

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• Fix - Allow overriding an object field with null #​144

v5.1.1

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• Fix - Drop <reference types="webpack-dev-server" /> from index.d.ts #​143

v5.1.0

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• Feature - Expose merge as default for backwards-compatibility with TypeScript. Now import merge from "webpack-merge"; works there. In CommonJS, the default alias is exposed through default property due to technical constraints.

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