fix(util-stream): rename downlevel-dts to build:types:downlevel (#3355)

Author: trivikr

packages/util-stream-browser/package.json

@@ -5,7 +5,7 @@
     "build": "concurrently 'yarn:build:es' 'yarn:build:types'",
     "build:es": "tsc -p tsconfig.es.json",
     "build:types": "tsc -p tsconfig.types.json",
-    "downlevel-dts": "downlevel-dts dist-types dist-types/ts3.4",
+    "build:types:downlevel": "downlevel-dts dist-types dist-types/ts3.4",
     "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo",
     "test": "exit 0"
   },

packages/util-stream-node/package.json

@@ -6,7 +6,7 @@
     "build:cjs": "tsc -p tsconfig.cjs.json",
     "build:es": "tsc -p tsconfig.es.json",
     "build:types": "tsc -p tsconfig.types.json",
-    "downlevel-dts": "downlevel-dts dist-types dist-types/ts3.4",
+    "build:types:downlevel": "downlevel-dts dist-types dist-types/ts3.4",
     "clean": "rimraf ./dist-* && rimraf *.tsbuildinfo",
     "test": "jest"
   },