chore: release 4.5.6 (#785)

🤖 I have created a release \*beep\* \*boop\*
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### [4.5.6](https://www.github.com/googleapis/nodejs-speech/compare/v4.5.5...v4.5.6) (2021-08-02)


### Bug Fixes

* failing tests for LRO check methods ([#784](https://www.github.com/googleapis/nodejs-speech/issues/784)) ([08e4276](https://www.github.com/googleapis/nodejs-speech/commit/08e4276a39a74a45300041278dc3c63602971c10))
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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": "^4.5.5",
+    "@google-cloud/speech": "^4.5.6",
     "@google-cloud/storage": "^5.0.0",
     "chalk": "^4.0.0",
     "node-record-lpcm16": "^1.0.1",