fix(deps): update dependency @google-cloud/connect-firestore to v2

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
@google-cloud/connect-firestore	dependencies	major	^1.0.3 -> ^2.0.0

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Release Notes

googleapis/nodejs-firestore-session

### [`v2.0.0`](https://togithub.com/googleapis/nodejs-firestore-session/blob/master/CHANGELOG.md#​200-httpswwwgithubcomgoogleapisnodejs-firestore-sessioncomparev106v200-2020-10-29) [Compare Source](https://togithub.com/googleapis/nodejs-firestore-session/compare/v1.0.6...v2.0.0) ##### ⚠ BREAKING CHANGES - **deps:** update dependency [@​google-cloud/firestore](https://togithub.com/google-cloud/firestore) to v4 ([#​136](https://togithub.com/googleapis/nodejs-firestore-session/issues/136)) - drop node8 ([#​121](https://togithub.com/googleapis/nodejs-firestore-session/issues/121)) ##### Bug Fixes - **deps:** update dependency [@​google-cloud/firestore](https://togithub.com/google-cloud/firestore) to v4 ([#​136](https://www.github.com/googleapis/nodejs-firestore-session/issues/136)) ([378ab11](https://www.github.com/googleapis/nodejs-firestore-session/commit/378ab112f1d67525897c7331cdae8d3c1452ea09)) - apache license URL ([#​468](https://www.github.com/googleapis/nodejs-firestore-session/issues/468)) ([#​116](https://www.github.com/googleapis/nodejs-firestore-session/issues/116)) ([97470bf](https://www.github.com/googleapis/nodejs-firestore-session/commit/97470bf0e6811b608a64a0fae732c5d846887a9f)) - correctly pass firestoreStore constructor parameters ([#​128](https://www.github.com/googleapis/nodejs-firestore-session/issues/128)) ([6358034](https://www.github.com/googleapis/nodejs-firestore-session/commit/63580348838622f4d9420089bc298b4f382466d2)) ##### Build System - drop node8 ([#​121](https://www.github.com/googleapis/nodejs-firestore-session/issues/121)) ([88834e2](https://www.github.com/googleapis/nodejs-firestore-session/commit/88834e2cc5d4189ca893f6bb387a50df2314922d)) ##### [1.0.6](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.5...v1.0.6) (2019-12-31) ##### Bug Fixes - **deps:** update dependency [@​google-cloud/firestore](https://togithub.com/google-cloud/firestore) to v3 ([#​77](https://www.github.com/googleapis/nodejs-firestore-session/issues/77)) ([2c8bddf](https://www.github.com/googleapis/nodejs-firestore-session/commit/2c8bddf82df0d1877183216ef8543774e4b61170)) ##### [1.0.5](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.4...v1.0.5) (2019-12-05) ##### Bug Fixes - **deps:** pin TypeScript below 3.7.0 ([d7cc073](https://www.github.com/googleapis/nodejs-firestore-session/commit/d7cc07310eb30af04d754b2ba79e6ae56baefa83)) - **docs:** bump release level to GA ([#​72](https://www.github.com/googleapis/nodejs-firestore-session/issues/72)) ([7da3ab1](https://www.github.com/googleapis/nodejs-firestore-session/commit/7da3ab12b357d5d4065081ddca3227e6e7df3dc6)) ##### [1.0.4](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.3...v1.0.4) (2019-11-14) ##### Bug Fixes - **docs:** add jsdoc-region-tag plugin ([#​66](https://www.github.com/googleapis/nodejs-firestore-session/issues/66)) ([23a9b82](https://www.github.com/googleapis/nodejs-firestore-session/commit/23a9b82d607ae97cfe2be76a5a2a1888c211f3d2)) ##### [1.0.3](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.2...v1.0.3) (2019-06-26) ##### Bug Fixes - **docs:** link to reference docs section on googleapis.dev ([#​43](https://www.github.com/googleapis/nodejs-firestore-session/issues/43)) ([8ebba84](https://www.github.com/googleapis/nodejs-firestore-session/commit/8ebba84)) ##### [1.0.2](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.1...v1.0.2) (2019-06-14) ##### Bug Fixes - **docs:** move to new client docs URL ([#​40](https://www.github.com/googleapis/nodejs-firestore-session/issues/40)) ([241bb6f](https://www.github.com/googleapis/nodejs-firestore-session/commit/241bb6f)) ##### [1.0.1](https://www.github.com/googleapis/nodejs-firestore-session/compare/v1.0.0...v1.0.1) (2019-06-06) ##### Bug Fixes - **deps:** update dependency [@​google-cloud/firestore](https://togithub.com/google-cloud/firestore) to v2 ([#​31](https://www.github.com/googleapis/nodejs-firestore-session/issues/31)) ([a9eeb8c](https://www.github.com/googleapis/nodejs-firestore-session/commit/a9eeb8c))

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