chore: release 2.6.0 (#583)

🤖 I have created a release \*beep\* \*boop\*
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## [2.6.0](https://www.github.com/googleapis/nodejs-compute/compare/v2.5.1...v2.6.0) (2021-06-29)


### Features

* Adding implementation of startWithEncryptionKey api call ([#539](https://www.github.com/googleapis/nodejs-compute/issues/539)) ([f8018a6](https://www.github.com/googleapis/nodejs-compute/commit/f8018a61bf0b986d6ad2d5a9216c5bcfb4bdcc6f))
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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).

compute/package.json

@@ -15,7 +15,7 @@
     "test": "mocha --timeout 1200000"
   },
   "dependencies": {
-    "@google-cloud/compute": "^2.5.1",
+    "@google-cloud/compute": "^2.6.0",
     "@sendgrid/mail": "^7.0.0",
     "node-fetch": "^2.3.0",
     "nodemailer": "^6.0.0",