fix(deps): update all non-major dependencies

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/firestore	^4.8.0 -> ^4.8.1
firebase-tools	^8.19.0 -> ^8.20.0
uglify-js	^3.12.1 -> ^3.12.2

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Release Notes

googleapis/nodejs-firestore

### [`v4.8.1`](https://togithub.com/googleapis/nodejs-firestore/blob/master/CHANGELOG.md#​481-httpswwwgithubcomgoogleapisnodejs-firestorecomparev480v481-2020-12-16) [Compare Source](https://togithub.com/googleapis/nodejs-firestore/compare/v4.8.0...v4.8.1)

firebase/firebase-tools

### [`v8.20.0`](https://togithub.com/firebase/firebase-tools/releases/v8.20.0) [Compare Source](https://togithub.com/firebase/firebase-tools/compare/v8.19.0...v8.20.0) - Shows missing documents in Emulator UI Firestore viewer. - Better supports paths with special characters in Emulator UI Firestore viewer. - Fixes generating email link from Admin SDK failing with Auth Emulator ([#​2933](https://togithub.com/firebase/firebase-tools/issues/2933)). - Fixes issue where multiple set-cookie headers were being proxied incorrectly in proxied responses through the Firebase Hosting emulator ([#​2931](https://togithub.com/firebase/firebase-tools/issues/2931)).

mishoo/UglifyJS

### [`v3.12.2`](https://togithub.com/mishoo/UglifyJS/releases/v3.12.2) [Compare Source](https://togithub.com/mishoo/UglifyJS/compare/v3.12.1...v3.12.2)  

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