spelling: does not exist

Signed-off-by: Josh Soref <2119212+jsoref@users.noreply.github.com>

__tests__/setup-go.test.ts

@@ -544,7 +544,7 @@ describe('setup-go', () => {
     expect(added).toBeFalsy();
   });
 
-  it('adds bin if dir not exists', async () => {
+  it('adds bin if dir does not exist', async () => {
     whichSpy.mockImplementation(async () => {
       return '/usr/local/go/bin/go';
     });