chore: release 3.7.2 (#270)

🤖 I have created a release \*beep\* \*boop\*
---
### [3.7.2](https://www.github.com/googleapis/nodejs-secret-manager/compare/v3.7.1...v3.7.2) (2021-06-24)


### Bug Fixes

* make request optional in all cases ([#269](https://www.github.com/googleapis/nodejs-secret-manager/issues/269)) ([99596db](https://www.github.com/googleapis/nodejs-secret-manager/commit/99596dbe31a9837fa903604305547ef8307c11bb))
---


This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

secret-manager/package.json

@@ -14,7 +14,7 @@
  "test": "c8 mocha --recursive test/ --timeout=800000"
  },
  "dependencies": {
- "@google-cloud/secret-manager": "^3.7.1"
+ "@google-cloud/secret-manager": "^3.7.2"
  },
  "devDependencies": {
  "c8": "^7.0.0",