chore: release 2.4.2 (#472)

🤖 I have created a release \*beep\* \*boop\*
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### [2.4.2](https://www.github.com/googleapis/nodejs-kms/compare/v2.4.1...v2.4.2) (2021-06-29)


### Bug Fixes

* **deps:** google-gax v2.17.0 with mTLS ([#471](https://www.github.com/googleapis/nodejs-kms/issues/471)) ([9841f22](https://www.github.com/googleapis/nodejs-kms/commit/9841f227e64da2ee6158b6c43a0339c2b1fa8e3a))
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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]

kms/package.json

@@ -14,7 +14,7 @@
     "test": "c8 mocha --recursive test/ --timeout=800000"
   },
   "dependencies": {
-    "@google-cloud/kms": "^2.4.1",
+    "@google-cloud/kms": "^2.4.2",
     "fast-crc32c": "^2.0.0",
     "jslint": "^0.12.1"
   },