Update dependency gts to v3.1.1

Author: renovate[bot]

package.json

@@ -29,7 +29,7 @@
     "@types/node": "13.13.46",
     "@types/xml2json": "0.11.4",
     "eslint-plugin-jest": "25.7.0",
-    "gts": "3.1.0",
+    "gts": "3.1.1",
     "jest": "27.5.1",
     "test-fixture": "2.4.1",
     "ts-jest": "27.1.3",