Update dependency webpack-merge to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
webpack-merge	devDependencies	major	4.2.1 -> 5.1.3

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Release Notes

survivejs/webpack-merge

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.

v5.0.9

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• Fix - Don't crash on merge() and merge([]). Now {} is returned in these corner cases.

v5.0.8

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• Fix - Support Node 10 #​138

v5.0.7

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• Fix - Drop tslib dependency by setting "importHelpers": false,

v5.0.6

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• Fix - Add tslib to dependencies

v5.0.5

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• Tech - Optimize build size (UMD isn't needed)

v5.0.4

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• Documentation - Use CommonJS imports at the examples. #​137

v5.0.3

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• Feature - Support TypeScript out of the box. #​84 #​86 #​95 #​110 #​112
• Deprecation - merge.smart has been dropped as it's tricky to support all the corner cases. Instead, it's better to use the provided utilities to put together a merge that fits your case.
• Deprecation - mergeStrategy has been dropped in favor of using mergeWithCustomize with customizeArray and customizeObject.
• Deprecation - merge.multiple has been dropped as the functionality was too specific and it's better to implement in the user space if needed.
• Breaking - merge has been moved as a regular import (i.e. import { merge } from 'webpack-merge').
• Breaking - Merge customization has been moved behind mergeWithCustomize.
• Breaking - Bump supported Node version to 12
• Feature - customizeArray supports wildcards now. Example: 'entry.*': 'prepend'. #​45 #​99
• Feature - Throw an error in case a Promise is being merged. It's better to wrap configuration within a Promise and merge inside it. #​81
• Fix - Drop lodash in favor of simpler dependencies. #​134
• Fix - Make unique merge from right to left to match behavior elsewhere. #​119
• Fix - Make sure unique doesn't lose non-unique items to merge. #​125

Special thanks to Google and Addy Osmani for supporting the work financially as it allowed me to complete the work required by the new major release.

v5.0.0

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v4.2.2

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• Fix - Update minimum version of lodash to 4.17.15 in order to avoid npm audit warning. #​116
• Docs - Improve merge.unique documentation. #​103
• Docs - Add clear note about precedence. #​115

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