Fix type errors

Author: jhutchings1

dist/index.js

@@ -1,5 +1,5 @@
-import core from '@actions/core';
-import github from '@actions/github';
+import * as core from '@actions/core';
+import * as github from '@actions/github';
 
 import {
   PackageCache,

dist/index.js.map

@@ -5,8 +5,6 @@
   "main": "index.ts",
   "scripts": {
     "lint": "eslint .",
-    "base-build": "npm ci && tsc",
-    "build": "npm run base-build && npm exec -- @vercel/ncc build --source-map lib/src/index.js",
     "prepare": "ncc build index.ts -o dist --source-map --license licenses.txt",
     "test": "node --experimental-vm-modules node_modules/jest/bin/jest.js",
     "all": "npm run lint && npm run prepare && npm run test"