Remove archive settings that defeat reproducible builds

Remove preserveFileTimestamps = true and reproducibleFileOrder = false from archive tasks, in either DSL spelling, so the archive takes Gradle's own default instead. Timestamps written into an archive, and file order that follows the filesystem, both make the same sources produce a different artifact on each build, which means a published artifact cannot be checked against a rebuild of its sources. The reproducible values written explicitly are left alone, since someone who wrote them agrees with the default and said so deliberately. Gradle's own defaults only became the reproducible ones in Gradle 9; on earlier versions removing these settings leaves the archive as it was. See the Gradle best practice.