chore(deps): update dependency gts to v3 (#591)

* chore(deps): update dependency gts to v3

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packages/google-cloud-asset/package.json

@@ -52,7 +52,7 @@
     "@types/sinon": "^10.0.0",
     "c8": "^7.1.0",
     "codecov": "^3.6.5",
-    "gts": "^2.0.0",
+    "gts": "^3.0.0",
     "jsdoc": "^3.6.3",
     "jsdoc-fresh": "^1.0.2",
     "jsdoc-region-tag": "^1.0.4",