fix: update minimum grpc-js to 1.10.3 to skip potentially problematic…

… 1.10.2 (#1576)

Some people were having issues with 1.10.2 across multiple products and those issues were solved with 1.10.3.

https://github.com/grpc/grpc-node/issues/2690

(Not all issues, and there is also 1.10.4 now, but it seems 1.10.2 in particular might be problematic.)

gax/package.json

@@ -10,7 +10,7 @@
     "!build/src/**/*.map"
   ],
   "dependencies": {
-    "@grpc/grpc-js": "~1.10.0",
+    "@grpc/grpc-js": "~1.10.3",
     "@grpc/proto-loader": "^0.7.0",
     "@types/long": "^4.0.0",
     "abort-controller": "^3.0.0",