GStreamer 1.0: Merge O4 dev and fix cuda sync
Catches up to !93 (merged).
Testing
Runs here: /fred/oz996/tdavies/spiir_project/sources/testing/gout/py3/MR95_tests
Analysis here: /fred/oz016/tdavies/projects/tanghyd__spiir/spiir_python_tests/logs/test_zerolags_3_11_MR95_MR94