fix(linkedin): Use HTTP response code

Similar to 8705514 but for LinkedIn
- If LinkedIn responds with  a 401 in case of an invalid token,
  raise an `HTTPError` (resp.raise_for_status) to handle the
  exception correctly instead of the current Http500 status
  because of a `KeyError`.

allauth/socialaccount/providers/linkedin_oauth2/views.py

@@ -27,6 +27,7 @@ def get_user_info(self, token):
         fields = self.get_provider().get_profile_fields()
         url = self.profile_url + ':(%s)?format=json' % ','.join(fields)
         resp = requests.get(url, params={'oauth2_access_token': token.token})
+        resp.raise_for_status()        
         return resp.json()