Replaced np.int and np.bool

[namanmistry]

Description

As in the issue Leftover use of np.int and np.bool #1034 I have replaced the np.int and np.bool with np.int_ and np.bool_ in the bias_variance_decomp.py and holdout.py files.

Related issues or pull requests

Fixes Leftover use of np.int and np.bool #1034

Pull Request Checklist

• [x] Ran PYTHONPATH='.' pytest ./mlxtend -sv and make sure that all unit tests pass (for small modifications, it might be sufficient to only run the specific test file, e.g., PYTHONPATH='.' pytest ./mlxtend/classifier/tests/test_stacking_cv_classifier.py -sv)
• [x] Checked for style issues by running flake8 ./mlxtend

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (f14f4c6) 77.27% compared to head (4e71a7e) 77.27%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1040 +/- ## ======================================= Coverage 77.27% 77.27% ======================================= Files 200 200 Lines 11307 11307 Branches 1484 1484 ======================================= Hits 8737 8737 Misses 2351 2351 Partials 219 219 ``` | [Impacted Files](https://app.codecov.io/gh/rasbt/mlxtend/pull/1040?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sebastian+Raschka) | Coverage Δ | | |---|---|---| | [mlxtend/evaluate/bias\_variance\_decomp.py](https://app.codecov.io/gh/rasbt/mlxtend/pull/1040?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sebastian+Raschka#diff-bWx4dGVuZC9ldmFsdWF0ZS9iaWFzX3ZhcmlhbmNlX2RlY29tcC5weQ==) | `68.88% <100.00%> (ø)` | | | [mlxtend/evaluate/holdout.py](https://app.codecov.io/gh/rasbt/mlxtend/pull/1040?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Sebastian+Raschka#diff-bWx4dGVuZC9ldmFsdWF0ZS9ob2xkb3V0LnB5) | `92.85% <100.00%> (ø)` | |

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[rasbt]

Thanks for the fix!