chore: remove workaround for setOutput (#374)

Co-authored-by: CrazyMax <crazy-max@users.noreply.github.com>

__tests__/context.test.ts

@@ -1,35 +0,0 @@
-import {beforeEach, describe, expect, it, jest} from '@jest/globals';
-import * as os from 'os';
-import * as context from '../src/context';
-
-describe('setOutput', () => {
-  beforeEach(() => {
-    process.stdout.write = jest.fn() as typeof process.stdout.write;
-  });
-
-  // eslint-disable-next-line jest/expect-expect
-  it('setOutput produces the correct command', () => {
-    context.setOutput('some output', 'some value');
-    assertWriteCalls([`::set-output name=some output::some value${os.EOL}`]);
-  });
-
-  // eslint-disable-next-line jest/expect-expect
-  it('setOutput handles bools', () => {
-    context.setOutput('some output', false);
-    assertWriteCalls([`::set-output name=some output::false${os.EOL}`]);
-  });
-
-  // eslint-disable-next-line jest/expect-expect
-  it('setOutput handles numbers', () => {
-    context.setOutput('some output', 1.01);
-    assertWriteCalls([`::set-output name=some output::1.01${os.EOL}`]);
-  });
-});
-
-// Assert that process.stdout.write calls called only with the given arguments.
-function assertWriteCalls(calls: string[]): void {
-  expect(process.stdout.write).toHaveBeenCalledTimes(calls.length);
-  for (let i = 0; i < calls.length; i++) {
-    expect(process.stdout.write).toHaveBeenNthCalledWith(i + 1, calls[i]);
-  }
-}