chore: release 2.6.0 (#488)

🤖 I have created a release \*beep\* \*boop\*
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## [2.6.0](https://www.github.com/googleapis/nodejs-kms/compare/v2.5.0...v2.6.0) (2021-08-17)


### Features

* **kms:** add samples for new rng and hmac kms apis ([#487](https://www.github.com/googleapis/nodejs-kms/issues/487)) ([5278a8e](https://www.github.com/googleapis/nodejs-kms/commit/5278a8e62c14fcc5cc02e4bd7b36e68a4ed48b72))


### Bug Fixes

* **deps:** google-gax v2.24.1 ([#489](https://www.github.com/googleapis/nodejs-kms/issues/489)) ([f5e8569](https://www.github.com/googleapis/nodejs-kms/commit/f5e85696de33d8870951d684b491338fc3c029f3))
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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": "^2.5.0",
+    "@google-cloud/kms": "^2.6.0",
     "fast-crc32c": "^2.0.0",
     "jslint": "^0.12.1"
   },