fix(deps): update dependency escape-string-regexp to v2 (#457)

Author: renovate[bot]

package.json

@@ -55,7 +55,7 @@
     "arrify": "^2.0.0",
     "concat-stream": "^2.0.0",
     "dot-prop": "^5.0.0",
-    "escape-string-regexp": "^1.0.5",
+    "escape-string-regexp": "^2.0.0",
     "extend": "^3.0.0",
     "google-auth-library": "^3.0.0",
     "google-gax": "^0.25.0",