bump: version 1.2.0 -> 1.2.1

[d33bs]

Description

This PR bumps the version to help patch CITATION.cff formatting to help release the code on Zenodo (along with other relevant changes which have occurred since v1.2.0).

What is the nature of your change?

• Bug fix (fixes an issue).
• Enhancement (adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).
• This change requires a documentation update.

Checklist

Please ensure that all boxes are checked before indicating that a pull request is ready for review.

• I have read the CONTRIBUTING.md guidelines.
• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• New and existing unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have deleted all non-relevant text in this pull request template.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.74%. Comparing base (0388f50) to head (dd81d5c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #461   +/-   ##
=======================================
  Coverage   94.74%   94.74%           
=======================================
  Files          57       57           
  Lines        3156     3156           
=======================================
  Hits         2990     2990           
  Misses        166      166           

Flag	Coverage Δ
unittests	94.74% <ø> (ø)

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