chore: release 2.8.0 (#494)

🤖 I have created a release \*beep\* \*boop\*
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## [2.8.0](https://www.github.com/googleapis/nodejs-kms/compare/v2.7.0...v2.8.0) (2021-08-30)


### Features

* add support for Key Reimport ([#493](https://www.github.com/googleapis/nodejs-kms/issues/493)) ([9728525](https://www.github.com/googleapis/nodejs-kms/commit/97285257ec5c28821eb9c7c8d4bb50d2729bf95a))
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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": "^2.7.0",
+    "@google-cloud/kms": "^2.8.0",
     "fast-crc32c": "^2.0.0",
     "jslint": "^0.12.1"
   },