Fix Error in get_remaining_time_in_millis

[subssn21]

Fix Error: unsupported operand type(s) for -: 'str' and 'int'

Currently calls to this function give:
Error: unsupported operand type(s) for -: 'str' and 'int'
File "/Users/dramus/chartflow/node_modules/sst/support/python-runtime/runtime.py", line 101, in
result = handler(event, context)

 File "/Users/dramus/.virtualenvs/chartflow/lib/python3.13/site-packages/datadog_lambda/wrapper.py", line 239, in __call__
"""Executes when the wrapped function gets called"""

 File "/Users/dramus/.virtualenvs/chartflow/lib/python3.13/site-packages/ddtrace/contrib/internal/aws_lambda/patch.py", line 117, in __call__
self._before(args, kwargs)
~~~~~~~~~~~~^^^^^^^^^^^^^^

 File "/Users/dramus/.virtualenvs/chartflow/lib/python3.13/site-packages/ddtrace/contrib/internal/aws_lambda/patch.py", line 145, in _before
self.timeoutChannel._start()
~~~~~~~~~~~~~~~~~~~~~~~~~~^^

 File "/Users/dramus/.virtualenvs/chartflow/lib/python3.13/site-packages/ddtrace/contrib/internal/aws_lambda/patch.py", line 74, in _start
remaining_time_in_millis = self.context.get_remaining_time_in_millis()

 File "/Users/dramus/chartflow/node_modules/sst/support/python-runtime/runtime.py", line 38, in get_remaining_time_in_millis
return int(max(self.deadline_ms - int(round(time() * 1000)), 0))
               ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

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