1.6.3

Changed

• Changed the implementation of the lock for the image repository metadata file to a mechanism based on flock(2).
  The new implementation can support both shared locks (a.k.a. read locks) and exclusive locks (a.k.a. write locks),
  and improves the startup time when launching large numbers of containers at scale.
• Updated recommended runc version to 1.1.12
• Updated recommended libnvidia-container version to 1.14.5
• Updated recommended NVIDIA Container Toolkit version to 1.14.5
• Updated CI integration tests on Rocky 8 to use Python 3.9, solving a problem of missing wheel packages for the previous Python version
• Updated CI distributed tests to use Docker Compose V2 and Compose file format version 3
• Updated automatic documentation build to use Sphinx 7.2.6 and Sphinx RTD Theme 2.0.0