grpc-js-xds: Drop support for Node versions below 16

Author: murgatroid99

packages/grpc-js-xds/package.json

@@ -53,7 +53,7 @@
     "@grpc/grpc-js": "~1.8.0"
   },
   "engines": {
-    "node": ">=10.10.0"
+    "node": ">=16.0.0"
   },
   "files": [
     "src/**/*.ts",

run-tests.sh

@@ -28,7 +28,7 @@ cd $ROOT
 git submodule update --init --recursive
 
 if [ ! -n "$node_versions" ] ; then
-  node_versions="14 16"
+  node_versions="16"
 fi
 
 set +ex