chore: rewrite use of chorno crate to use just time crate

Lars Wirzeniusrequested to merge
liw/chrono into main

Description

Closes #251 (closed) and #252 (closed), two security issues.

Checklist

  • You have read, and followed the guidance in, the CONTRIBUTING guide
  • The MR content has run through a pipeline, or at least has pipelines enabled.
  • There are no licence concerns with this contribution (The README clearly states Subplot is MIT-0)

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