Update dependency redux-form to v8.3.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
redux-form (source)	8.3.5 -> 8.3.8
@types/redux-form	8.2.5 -> 8.3.5

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Release Notes

redux-form/redux-form

v8.3.8

Compare Source

• Fix peer dependency for react 17.0.x (#​4722)

v8.3.7

Compare Source

• Update onSubmit when handleSubmit changes #​4684 #​4682

v8.3.6

Compare Source

• refactor(Fields): remove react legacy string refs 47ad2fd
• chore: replace 4 years old redux-immutablejs with redux-immutable 0c4a047
• chore: add env table to issue template 00b23eb
• revert: chore: remove flow-types from repo, install them on postinstall 1bba658
• chore: fix flow types for new added definitions ed62498
• chore: add scarf analytics 263474e
• chore: remove flow-types from repo, install them on postinstall e5a2917
• chore: remove docs label from stale issues 674134e
• chore: upgrade flow-bin to 0.84, need for future migrations b1a6960
• chore: update eslint f6dc97d
• chore: remove unused lodash-es 08f0fa3
• chore: remove unused babel plugins and presets 1b89f1f
• chore: remove unused uglifyjs-webpack-plugin 366f9a2
• chore: npm update 1570032
• chore(flow): ignore build folders from static typing e5171b9
• refactor(flow): fix flow untyped-type-import warnings 4316736

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