[#1498] Upgrade react-redux to 7.2.0

[catarak]

Fixes #1498

I have verified that this pull request:

• has no linting errors (npm run lint)
• is from a uniquely-named feature branch and has been rebased on top of the latest master. (If I was asked to make more changes, I have made sure to rebase onto master then too)
• is descriptively named and links to an issue number, i.e. Fixes #123

It turns out this was pretty simple and I didn't need to change any code! @ghalestrilo can you test on your computer and confirm it's working okay?

[ghalestrilo]

Just tested. Seems to be working fine!