v0.39.0-anx.v4

Custom build of 0.39.0 which includes:

• Python 3.12 compatibility (cherry picked from upstream main)
• Python build improvements (cherry picked from upstream main)
• Go 1.21 compatibility (cherry picked from upstream main)
• apache#431: Fix for sending multiple large messages in Go (PROTON-2785)
• apache#432: Fix segfault with acknowledging a message on closed receiver (PROTON-2843)
• apache#433: Add py.typed marker to package for PEP 561 (PROTON-2848)

v0.39.0-anx.v1

Custom build of 0.39.0 which includes:

• Python 3.12 compatibility (cherry picked from upstream main)
• apache#431: Fix for sending multiple large messages in Go (PROTON-2785)