Update dependency eslint-config-amo to v4.9.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-config-amo	4.8.0 -> 4.9.0

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Release Notes

mozilla/eslint-config-amo

### [`v4.9.0`](https://togithub.com/mozilla/eslint-config-amo/releases/4.9.0) [Compare Source](https://togithub.com/mozilla/eslint-config-amo/compare/4.8.0...4.9.0) #### Main changes None. #### dependencies - Updated: dependency `eslint-plugin-import` to v2.24.2 ([#​345](https://togithub.com/mozilla/eslint-config-amo/issues/345)) - Updated: dependency `eslint-plugin-jest` to v24.4.0 ([#​339](https://togithub.com/mozilla/eslint-config-amo/issues/339)) - Updated: dependency `eslint-plugin-prettier` to v3.4.1 ([#​344](https://togithub.com/mozilla/eslint-config-amo/issues/344)) - Updated: dependency `eslint-plugin-react` to v7.25.1 ([#​348](https://togithub.com/mozilla/eslint-config-amo/issues/348)) #### others - Use Node 14 and 16 (those are the Node versions we officially support) ([#​337](https://togithub.com/mozilla/eslint-config-amo/issues/337)) - Lock file maintenance

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