* Replace java.time APIs with kotlin(x).(date)time
kotlinx-datetime explicitly says in its README that it does not cover
i18n, so we have to stick with using their toJavaX converters wherever
we localise dates and times.
Yes, some of these replacements are... questionable. But I wanted to
try and maximise the replacement for now.
* Bump kotlinx-datetime to 0.8.0
* More kotlin.time/kotlinx-datetime replacements
* Remove redundant init block & make attributes val
* Replace new use of java.time.Instant
Apparently, this is all that's needed to replace the forbidden
`Task.project` accessor, which would be an error in Gradle v10 (it's
been deprecated for a while)
This will also allow us to use the Configuration Cache if we wanted
to.
AntsyLich