Set Authorization header to get request

Versions:
"supertest": "6.0.1",

Code example:

```
it('should fail getting all users, reason role = user', async () => {
const authHeaders = {Authorization: 'test'}

await request(app)
.get('/user/all')
.set(authHeaders)
.expect(({ headers }) => {
console.log(headers);
})
.expect(HttpStatus.NOT_FOUND);
});
```

**Actual behavior:** header is missing.

**Expected Behavior:** authheader to be part of the headers body