Update dependency eslint-config-amo to v3.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-config-amo	devDependencies	minor	3.3.0 -> 3.4.0

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Release Notes

mozilla/eslint-config-amo

### [`v3.4.0`](https://togithub.com/mozilla/eslint-config-amo/releases/3.4.0) [Compare Source](https://togithub.com/mozilla/eslint-config-amo/compare/3.3.0...3.4.0) - Lock file maintenance - Update dependency eslint-plugin-jest to v23.18.0 ([#​241](https://togithub.com/mozilla/eslint-config-amo/issues/241)) - Update dependency eslint-plugin-react to v7.20.3 ([#​240](https://togithub.com/mozilla/eslint-config-amo/issues/240)) - Update dependency eslint-plugin-import to v2.22.0 ([#​237](https://togithub.com/mozilla/eslint-config-amo/issues/237))

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