chore: release 2.4.0 (#465)

🤖 I have created a release \*beep\* \*boop\*
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## [2.4.0](https://www.github.com/googleapis/nodejs-kms/compare/v2.3.3...v2.4.0) (2021-06-14)


### Features

* add ECDSA secp256k1 to the list of supported algorithms ([#464](https://www.github.com/googleapis/nodejs-kms/issues/464)) ([a27f95d](https://www.github.com/googleapis/nodejs-kms/commit/a27f95dffdea8a803d02da443a38b10ed7720c86))
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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).

kms/package.json

@@ -14,7 +14,7 @@
     "test": "c8 mocha --recursive test/ --timeout=800000"
   },
   "dependencies": {
-    "@google-cloud/kms": "^2.3.3",
+    "@google-cloud/kms": "^2.4.0",
     "fast-crc32c": "^2.0.0",
     "jslint": "^0.12.1"
   },