[new release] mirage-logs (3.0.0)

[hannesm]

A reporter for the Logs library that writes log messages to stderr, using a Mirage CLOCK to add timestamps

• Project page: https://github.com/mirage/mirage-logs
• Documentation: https://mirage.github.io/mirage-logs/

CHANGES:

• Use mirage-ptime (a dune variant) instead of mirage-clock (use dune variants (mirage-ptime) instead of mirage-clock mirage/mirage-logs#29 @hannesm)

[hannesm]

CI looks fine, unrelated temporary failures.