build: update webpack-merge to version 5.2.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
webpack-merge	dependencies	minor	5.1.4 -> 5.2.0
webpack-merge	devDependencies	minor	5.1.4 -> 5.2.0

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Release Notes

survivejs/webpack-merge

v5.2.0

Compare Source

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

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