chore(main): release 2.6.0 (#612)

* chore(main): release 2.6.0

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: 2 people

cloud-tasks/package.json

@@ -15,7 +15,7 @@
     "start": "node server.js"
   },
   "dependencies": {
-    "@google-cloud/tasks": "^2.5.0",
+    "@google-cloud/tasks": "^2.6.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3"
   },