Prefer conda over pip for installation of particle

[GernotMaier]

Install 'particle' using conda in the environment (not sure why I haven't done this from the beginning).

Also: added a hint to the slightly different update command for micromamba (as I stumble over it all the time).

[ctao-dpps-sonarqube[bot]]

Analysis Details

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Coverage and Duplications

• No coverage information (89.70% Estimated after merge)
• No duplication information (0.00% Estimated after merge)

Project ID: gammasim_simtools_AY_ssha9WiFxsX-2oy_w

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