Fix pandas 425

[skon7]

resolves #425

Issue:

425 (AttributeError: 'DataFrame' object has no attribute 'append')

Description

This pull request addresses issue https://github.com/enzoampil/fastquant/issues/425 by replacing the append function with the concat function. The issue was caused by a compatibility problem with pandas versions greater than 2.

Changes Made:

• Replaced append with concat in relevant code sections notif_bot_POC.ipynb,crypto.py,pse.py and notification.py.

Checklist

• [x] I am making a pull request from a branch other than master
• [x] I have read the CONTRIBUTING.md

[skon7]

the problem because ccxt library uses this api GET https://api.bithumb.com/public/ticker/ALL_BTC and this generate an error FAILED python/tests/test_fastquant.py::test_get_crypto_data - ccxt.base.errors.NetworkError: bithumb GET https://api.bithumb.com/public/ticker/ALL_BTC because of bithumb exchange.

[skon7]

@enzoampil now all the apis works correctly (https://api.bithumb.com/public/ticker/ALL_BTC),all the tests in tests folder passed 9/9 and also the workflow tested in the localhost with Job succeeded.

[enzoampil]

thanks lgtm