fix(deps): update dependency google/cloud-tasks to v2 (GoogleCloudPlatform#2128)

Co-authored-by: Brent Shaffer <betterbrent@google.com>

Author: renovate-bot

tasks/composer.json

@@ -1,5 +1,5 @@
 {
     "require": {
-        "google/cloud-tasks": "^1.14"
+        "google/cloud-tasks": "^2.0"
     }
 }