Fix numpy deprecation warning in 2_hidden_layers_neural_network.py

[tianyizheng02]

Describe your change:

Contributes to #9718 by fixing the numpy deprecation warning in neural_networks/2_hidden_layers_neural_network.py:

neural_network/2_hidden_layers_neural_network.py::neural_network.2_hidden_layers_neural_network.TwoHiddenLayerNeuralNetwork.predict
neural_network/2_hidden_layers_neural_network.py::neural_network.2_hidden_layers_neural_network.example
  /home/runner/work/Python/Python/neural_network/2_hidden_layers_neural_network.py:224: DeprecationWarning: Conversion of an array with ndim > 0 to a scalar is deprecated, and will error in future. Ensure you extract a single element from your array before performing this operation. (Deprecated NumPy 1.25.)
    return int(self.layer_between_second_hidden_layer_and_output > 0.6)

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
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• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[tianyizheng02]

This PR successfully fixes the warning:

=============================== warnings summary ===============================
../../../../../opt/hostedtoolcache/Python/3.12.0/x64/lib/python3.12/site-packages/dateutil/tz/tz.py:37
  /opt/hostedtoolcache/Python/3.12.0/x64/lib/python3.12/site-packages/dateutil/tz/tz.py:37: 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).
    EPOCH = datetime.datetime.utcfromtimestamp(0)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html