new release 1.2.1

[orbeckst]

Service release 1.2.1 with updated Python support range 3.11 – 3.14

• finalize release prepare 1.2.1 release #34
• GitHub release
• testpypi
• pypi
• conda-forge (check https://github.com/conda-forge/pathsimanalysis-feedstock ) pathsimanalysis v1.2.1 conda-forge/pathsimanalysis-feedstock#5

[orbeckst]

(strictly speaking, this release was not necessary because this is a pure-python package that has been working with all Python versions ≥ 3.10...)