Bump ACTS Version to v39.0.0

Release notes are at https://github.com/acts-project/acts/releases/tag/v39.0.0

We only expect object count changes in a few ACTS tests.

fyi @cvarni @astefl @ncalace @tstreble @goetz @jmasik @sabidi

NOTE: The commit messages contain references to the relevant ACTS PRs, so it would probably be nice to not squash them during merging.