gobin: use execFile instead of exec to query GOPATH

Should fix the behavior on Windows.

__tests__/gobin.test.ts

@@ -6,12 +6,12 @@ jest.mock('child_process');
 describe('gobin', () => {
   const childProcess = require('child_process');
 
-  let execSpy: jest.SpyInstance;
+  let execFileSpy: jest.SpyInstance;
   let gopath = path.join('home', 'user', 'go');
 
   beforeEach(() => {
-    execSpy = jest.spyOn(childProcess, 'exec');
-    execSpy.mockImplementation((_command, callback) => {
+    execFileSpy = jest.spyOn(childProcess, 'execFile');
+    execFileSpy.mockImplementation((_file, _args, callback) => {
       callback('', {stdout: gopath, stderr: ''});
     });
   });

dist/index.js

@@ -3275,11 +3275,11 @@ Object.defineProperty(exports, "__esModule", { value: true });
 const childProcess = __importStar(__webpack_require__(129));
 const path = __importStar(__webpack_require__(622));
 const util_1 = __webpack_require__(669);
-const exec = util_1.promisify(childProcess.exec);
+const execFile = util_1.promisify(childProcess.execFile);
 function getGOBIN(installDir) {
     return __awaiter(this, void 0, void 0, function* () {
         const goExecutable = path.join(installDir, 'bin', 'go');
-        const result = yield exec(`${goExecutable} env GOPATH`);
+        const result = yield execFile(goExecutable, ['env', 'GOPATH']);
         const gopath = result.stdout;
         return path.join(gopath, 'bin');
     });

src/gobin.ts

@@ -2,12 +2,12 @@ import * as childProcess from 'child_process';
 import * as path from 'path';
 import {promisify} from 'util';
 
-const exec = promisify(childProcess.exec);
+const execFile = promisify(childProcess.execFile);
 
 export async function getGOBIN(installDir: string): Promise<string> {
   const goExecutable = path.join(installDir, 'bin', 'go');
 
-  const result = await exec(`${goExecutable} env GOPATH`);
+  const result = await execFile(goExecutable, ['env', 'GOPATH']);
   const gopath = result.stdout;
   return path.join(gopath, 'bin');
 }