[pymesh] updated to match Pymesh release v1.20.2.r1

[catalinio]

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What does this implement/fix? Explain your changes.

Pymesh micropython library, included in Pymesh firmware binary release v1.20.2.r1.

Does this close any currently open issues?

Any relevant logs, error output, etc?

(If it’s long, please paste to https://gist.github.com and insert the link here)

Any other comments?

Where has this been tested?

• Board type and hardware version:
• os.uname() output: