chore: release 1.8.0 (#359)

Author: release-please[bot]

cloud-tasks/package.json

@@ -13,7 +13,7 @@
     "lint": "eslint '**/*.js'"
   },
   "dependencies": {
-    "@google-cloud/tasks": "^1.7.3",
+    "@google-cloud/tasks": "^1.8.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
     "yargs": "^15.0.0"