fix: update react-hot-loader to v4.12.21

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-hot-loader	4.12.6 -> 4.12.21

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Release Notes

gaearon/react-hot-loader

v4.12.21

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v4.12.20

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v4.12.19

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v4.12.18

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v4.12.17

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v4.12.16

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v4.12.15

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Bug Fixes

• React 16.10 support (b7ed82a)

v4.12.14

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Bug Fixes

• autodetect underupdated state and trigger an automatic update, fixes #​1342 (33c54f5)
• resolve all components to their last versions, #​1342 (62bc67e)

v4.12.13

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Bug Fixes

• error overlay should not be injected into the first instance, fixes #​1337 (c019663)
• return null for null types, fixes #​1324 (08d7ed1)
• run hot in batched mode, fixes #​1332 (e801daf)

v4.12.12

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Bug Fixes

• error overlay could fail by itself (da50985)
• resolve undefined types to undefined, fixes #​1324 (73eeb4e)
• speedup levenshtein comparison, fixes #​1087 (b81dcb0)

v4.12.11

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Features

• react 16.9 support, 1320 by @​Bnaya

Bug Fixes

• add noRegister option to webpack, #​1315 (e562375)
• remove circular deps from hot-loader (2cb544d)

v4.12.10

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Bug Fixes

• append react-hot-dom patch note to the ProxyFacade, fixes #​1311 (81bbb6a)
• use void IIFE for webpack plugin, fixes #​1309 (6089822)

v4.12.9

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Bug Fixes

• forcely update Context Provider, fixes #​1207 (897a68d)
• updating shallowequal dependency (9269580)

v4.12.8

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Bug Fixes

• script error on IE11 due to lack of Object.entries (6672b26)

v4.12.7

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Bug Fixes

• false negative comparisons with react-hot-dom enabled, fixes #​1299 (a1c5c31)
• reload hooks when hook body changes (4795456)

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