[bug] Fix inconsistent results produced on different platforms

[robomics]

Fix two bugs that resulted in different results being returned when running stripepy call on different platform (and potentially even when using different versions of numpy and pandas).

The first bug was caused by not forcing numpy and pandas to use stable sorting algorithms.
The second bug was due to minor difference in FP arithmetic on different architectures.

This first bug resulted in slightly different results produced on macOS and Linux (Windows and Linux produced consistent results).

The second bug resulted in different results when using different architectures (or even different CPUs with the same arch).

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.40%. Comparing base (53c5e5c) to head (bf83f98).
Report is 15 commits behind head on main.

Files with missing lines	Patch %	Lines
src/stripepy/utils/common.py	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #92      +/-   ##
==========================================
+ Coverage   85.32%   85.40%   +0.07%     
==========================================
  Files          19       19              
  Lines        2481     2494      +13     
==========================================
+ Hits         2117     2130      +13     
  Misses        364      364              

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[tests	integration	python-3.10](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.10
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[tests	integration	python-3.11
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[tests	integration	python-3.12
[tests	integration	python-3.13](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.13
[tests	integration	python-3.9](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	integration	python-3.9
[tests	unit	python-3.10](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.10
[tests	unit	python-3.11](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.11
[tests	unit	python-3.12](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.12
[tests	unit	python-3.13](https://app.codecov.io/gh/paulsengroup/StripePy/pull/92/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)
[tests	unit	python-3.13
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[tests	unit	python-3.9

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