Drop sourcemap references.

Author: grugnog

action/dist/index.js

@@ -1,4 +1,4 @@
-require('./sourcemap-register.js');/******/ (() => { // webpackBootstrap
+/******/ (() => { // webpackBootstrap
 /******/ 	var __webpack_modules__ = ({
 
 /***/ 8063:
@@ -28272,5 +28272,4 @@ module.exports = parseParams
 /******/ 	module.exports = __webpack_exports__;
 /******/ 	
 /******/ })()
-;
-//# sourceMappingURL=index.js.map
+;

action/package.json

@@ -5,8 +5,8 @@
   "private": true,
   "main": "dist/action.js",
   "scripts": {
-    "build": "tsc && ncc build dist/action.js -o dist --source-map --license licenses.txt",
-    "build:dev": "tsc",
+    "build": "tsc && ncc build dist/action.js -o dist --license licenses.txt",
+    "build:dev": "tsc && ncc build dist/action.js -o dist --source-map --license licenses.txt",
     "clean": "rm -rf dist/*",
     "test": "jest",
     "lint": "eslint src/**/*.ts"