fix(deps): update dependency @google-cloud/pubsub to v2.16.1 (#460)
fix(deps): update dependency @google-cloud/pubsub to v2.16.1 (#460)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [@google-cloud/pubsub](https://togithub.com/googleapis/nodejs-pubsub) | [`2.15.1` -> `2.16.1`](https://renovatebot.com/diffs/npm/@google-cloud%2fpubsub/2.15.1/2.16.1) | [![age](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpubsub/2.16.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpubsub/2.16.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpubsub/2.16.1/compatibility-slim/2.15.1)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/@google-cloud%2fpubsub/2.16.1/confidence-slim/2.15.1)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>googleapis/nodejs-pubsub</summary>

### [`v2.16.1`](https://togithub.com/googleapis/nodejs-pubsub/blob/master/CHANGELOG.md#&#8203;2161-httpswwwgithubcomgoogleapisnodejs-pubsubcomparev2160v2161-2021-07-21)

[Compare Source](https://togithub.com/googleapis/nodejs-pubsub/compare/v2.16.0...v2.16.1)

### [`v2.16.0`](https://togithub.com/googleapis/nodejs-pubsub/blob/master/CHANGELOG.md#&#8203;2160-httpswwwgithubcomgoogleapisnodejs-pubsubcomparev2151v2160-2021-07-12)

[Compare Source](https://togithub.com/googleapis/nodejs-pubsub/compare/v2.15.1...v2.16.0)

##### Features

-   Add method signature for Subscriber.Pull without the deprecated return_immediately field. ([#&#8203;1350](https://www.github.com/googleapis/nodejs-pubsub/issues/1350)) ([a7922fb](https://www.github.com/googleapis/nodejs-pubsub/commit/a7922fb345337d750789d1b672521c8440472cea))

##### Bug Fixes

-   **deps:** google-gax v2.17.0 with mTLS ([#&#8203;1344](https://www.github.com/googleapis/nodejs-pubsub/issues/1344)) ([0cd0a8c](https://www.github.com/googleapis/nodejs-pubsub/commit/0cd0a8c8c79e3ca7dfe1e2d1bf2a2f8894ba4680))
-   **deps:** google-gax v2.17.1 ([#&#8203;1353](https://www.github.com/googleapis/nodejs-pubsub/issues/1353)) ([d5bf563](https://www.github.com/googleapis/nodejs-pubsub/commit/d5bf56325374c5509c6b65c953b41c15533a2a0a))

##### [2.15.1](https://www.github.com/googleapis/nodejs-pubsub/compare/v2.15.0...v2.15.1) (2021-06-22)

##### Bug Fixes

-   make request optional in all cases ([#&#8203;1328](https://www.github.com/googleapis/nodejs-pubsub/issues/1328)) ([fa74fa1](https://www.github.com/googleapis/nodejs-pubsub/commit/fa74fa16c76f6b25ee1648ee51c397ccf01f71a4))

</details>

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