chore: unpin version of gts (#576)

Author: JustinBeckwith

core/common/package.json

@@ -56,7 +56,7 @@
     "@types/tmp": "0.1.0",
     "c8": "^7.1.0",
     "codecov": "^3.6.5",
-    "gts": "^2.0.0-alpha.6",
+    "gts": "^2.0.0",
     "linkinator": "^2.0.4",
     "mocha": "^7.1.1",
     "mv": "^2.1.1",