Update scipy gaussian import to avoid deprecation warnings

[ysalatheZI]

Description:

When running the example shfqa_qubit_readout_measurement.md, I've encountered the following deprecation warning from the SciPy library for the gaussian function:

DeprecationWarning: Importing gaussian from 'scipy.signal' is deprecated and will raise an error in SciPy 1.13.0. Please use 'scipy.signal.windows.gaussian' or the convenience function 'scipy.signal.get_window' instead.
  gauss = gaussian(2 * rise_fall_len, std_dev)

Therefore, this PR updates the import statements for this library function.

Fixes issue: #

Checklist:

• Add tests for the change to show correct behavior.
• Add or update relevant docs, code and examples.
• Update CHANGELOG.rst with relevant information and add the issue number.
• Add .. versionchanged:: where necessary.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9394cd7) 99.61% compared to head (3c85466) 99.61%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #272   +/-   ##
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  Coverage   99.61%   99.61%           
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  Files          40       40           
  Lines        2575     2575           
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  Hits         2565     2565           
  Misses         10       10           

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[tobiasah]

❤️ Thanks for fixing this