chore: release 4.5.3 (#769)

🤖 I have created a release \*beep\* \*boop\*
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### [4.5.3](https://www.github.com/googleapis/nodejs-speech/compare/v4.5.2...v4.5.3) (2021-06-29)


### Bug Fixes

* **deps:** google-gax v2.17.0 with mTLS ([#772](https://www.github.com/googleapis/nodejs-speech/issues/772)) ([582e5b7](https://www.github.com/googleapis/nodejs-speech/commit/582e5b71c68be635f7ce775f06d5e7b02180fbef))
* make request optional in all cases ([#768](https://www.github.com/googleapis/nodejs-speech/issues/768)) ([83e1b7b](https://www.github.com/googleapis/nodejs-speech/commit/83e1b7bd4cc2d6ffd95769a4a6f519ab23b9bc71))
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This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please).

Author: release-please[bot]

speech/package.json

@@ -15,7 +15,7 @@
     "test": "c8 mocha system-test --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/speech": "^4.5.2",
+    "@google-cloud/speech": "^4.5.3",
     "@google-cloud/storage": "^5.0.0",
     "chalk": "^4.0.0",
     "node-record-lpcm16": "^1.0.1",