fix(deps): update dependency @google-cloud/pubsub to v2.10.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/pubsub	2.8.0 -> 2.10.0

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Release Notes

googleapis/nodejs-pubsub

### [`v2.10.0`](https://togithub.com/googleapis/nodejs-pubsub/blob/master/CHANGELOG.md#​2100-httpswwwgithubcomgoogleapisnodejs-pubsubcomparev290v2100-2021-02-22) [Compare Source](https://togithub.com/googleapis/nodejs-pubsub/compare/v2.9.0...v2.10.0) ##### Features - export PublishError ([#​1216](https://www.github.com/googleapis/nodejs-pubsub/issues/1216)) ([7c75d70](https://www.github.com/googleapis/nodejs-pubsub/commit/7c75d70e12545859d011c289b251d2ef746de589)), closes [#​1215](https://www.github.com/googleapis/nodejs-pubsub/issues/1215) ### [`v2.9.0`](https://togithub.com/googleapis/nodejs-pubsub/blob/master/CHANGELOG.md#​290-httpswwwgithubcomgoogleapisnodejs-pubsubcomparev280v290-2021-02-10) [Compare Source](https://togithub.com/googleapis/nodejs-pubsub/compare/v2.8.0...v2.9.0) ##### Features - update protos from upstream ([#​1206](https://www.github.com/googleapis/nodejs-pubsub/issues/1206)) ([33526b0](https://www.github.com/googleapis/nodejs-pubsub/commit/33526b04373bd1ea40930d14b6fc6a344a814eff)) ##### Bug Fixes - bind promisify calls for flush() so they have a 'this' value ([#​1184](https://www.github.com/googleapis/nodejs-pubsub/issues/1184)) ([e494fb7](https://www.github.com/googleapis/nodejs-pubsub/commit/e494fb7303ae58b08f3f75aa87ea1f10c86f648e)) - **deps:** update dependency google-auth-library to v7 ([#​1207](https://www.github.com/googleapis/nodejs-pubsub/issues/1207)) ([fce2af1](https://www.github.com/googleapis/nodejs-pubsub/commit/fce2af18ef932b722dcaa9e1132ee145318bd81e)) - openTelemetry doc fails to generate for [#​1185](https://www.github.com/googleapis/nodejs-pubsub/issues/1185) ([#​1200](https://www.github.com/googleapis/nodejs-pubsub/issues/1200)) ([0600bde](https://www.github.com/googleapis/nodejs-pubsub/commit/0600bdef9447440605d129396c1915e7640f80ea)) - update synchronousPull example to avoid INVALID_ARGUMENT error ([#​1194](https://www.github.com/googleapis/nodejs-pubsub/issues/1194)) ([1f85345](https://www.github.com/googleapis/nodejs-pubsub/commit/1f853450e0822ebbaeab5892f5d76f5bc0e29537))

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