support python 3.14

[nsano-rururu]

If you change the python version in the dockerfile to 3.14 and run the test-docker command, the following warning will appear.
Regarding line 56 of prometheus_wrapper.py, PEP 765 states that starting with Python 3.14, code that uses return / break / continue from a finally block will be deprecated (a SyntaxWarning will be issued).

<unknown>:35: SyntaxWarning: 'return' in a 'finally' block
<unknown>:56: SyntaxWarning: 'return' in a 'finally' block
/home/elastalert/elastalert/prometheus_wrapper.py:35: SyntaxWarning: 'return' in a 'finally' block
  return self.run_rule(rule, endtime, starttime)
/home/elastalert/elastalert/prometheus_wrapper.py:56: SyntaxWarning: 'return' in a 'finally' block
  return res
                                                                                                                                                            [100%]
========================================================================== warnings summary ==========================================================================
../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
  /usr/local/lib/python3.14/unittest/mock.py:1170: PytestCollectionWarning: cannot collect 'test_args' because it is not a function.
    def __call__(self, /, *args, **kwargs):

../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
../../../usr/local/lib/python3.14/unittest/mock.py:1170
  /usr/local/lib/python3.14/unittest/mock.py:1170: PytestCollectionWarning: cannot collect 'testrule_args' because it is not a function.
    def __call__(self, /, *args, **kwargs):

alerters/tencentsms_test.py::test_tencentsms_alert_secret_id_error
  /home/elastalert/tests/.tox/py314/lib/python3.14/site-packages/tencentcloud/common/abstract_client.py:220: DeprecationWarning: datetime.datetime.utcfromtimestamp() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.fromtimestamp(timestamp, datetime.UTC).
    date = datetime.utcfromtimestamp(timestamp).strftime('%Y-%m-%d')

[nsano-rururu]

aws-requests-auth: The last release was in May 2020. There have been no updates for over four years. → Concerns exist regarding future viability, bug fixes, and compatibility with the latest Python.

[nsano-rururu]

aws-requests-auth to requests-aws4auth