Update release notes

Author: njroussel

docs/release_notes.rst

@@ -5,6 +5,19 @@ Being an experimental research framework, Dr.Jit does not strictly follow the
 `Semantic Versioning <https://semver.org/>`_ convention. That said, we will
 strive to document breaking API changes in the release notes below.
 
+Upcoming release
+----------------
+
+- Fix wavefront loops which would occasionally create new kernels
+  `[8f09760] <https://github.com/mitsuba-renderer/drjit/commit/8f0976008f3662756bb078f713e383a98f944e1d>`_
+- Fix source of CUDA segfaults
+  `[9aa2d87] <https://github.com/mitsuba-renderer/drjit/commit/9aa2d87a98be303368f991581ad5297782cba85a>`_
+- In C++ ``dr::binary_search`` could unexpectedly create new kernels
+  `[b48701e] <https://github.com/mitsuba-renderer/drjit/commit/b48701e713511526824a4675b30245d606ee33e5>`_
+- Minor chanes to support Nvidia v555 drivers
+  `[216d921] <https://github.com/mitsuba-renderer/drjit/commit/216d921797f49ecad7e2bff44ac7cd6089b5cded>`_
+
+
 Dr.Jit 0.4.4
 ------------