fix: ServiceNow _notify_update now uses PATCH to actually update tickets

[DragonBot00]

Summary

Fixes two related ServiceNow provider bugs in _notify_update:

1. Wrong HTTP method ([➕ Feature]: Do Real Updating Ticket in ServiceNowProvider #4949): Method was calling requests.get — it fetched the ticket but never modified it. Should be requests.patch.
2. Auth logic inverted ([🐛 Bug]: ServiceNowProvider failed to update ticket #4948): if self._access_token was used where if not self._access_token was needed, causing 401 errors when using token auth.

Also fixed a typo: resp.raise_for_status() → response.raise_for_status().

Closes #4949
Closes #4948

Changes

• Replaced requests.get with requests.patch in _notify_update
• Fixed auth condition: if self._access_token → if not self._access_token
• Added payload: dict = {} parameter so callers can pass update fields
• Updated _notify to forward payload + remaining kwargs as the update body
• Fixed variable name typo in error path
• Added docstring

Usage example

- name: update-ticket
  provider:
    type: servicenow
    config: "{{ providers.servicenow }}"
  with:
    table_name: incident
    ticket_id: "{{ alert.ticket_id }}"
    fingerprint: "{{ alert.fingerprint }}"
    payload:
      state: "6"
      close_notes: "Resolved by Keep automation"

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