Release httpx2 and httpcore2 2.4.0.

httpx2

• Add HTTPXDeprecationWarning, a UserWarning subclass shown by default. (Use a custom deprecation warning visible by default #1029)
• Limit the number of chained Content-Encoding decoders to 5. (Limit chained Content-Encoding decoders to 5 #1027)
• Allow version 15 of rich in the cli extra. (Allow version 15 of rich in httpx2’s cli extra #1015)
• Parse an empty Digest auth realm without crashing. (Parse empty Digest auth realm without crashing #1023)
• Decode IDNA labels in non-leading host positions. (Decode IDNA labels in non-leading host positions #1018)

httpcore2

• Move HTTP/2 stream events cleanup inside _state_lock. (Move HTTP/2 stream events cleanup inside _state_lock #1013)
• Release the HTTP/2 semaphore permit on NoAvailableStreamIDError. (Release HTTP/2 semaphore permit on NoAvailableStreamIDError #1012)
• Use RLock instead of Lock to prevent a thread deadlock. (Use RLock instead of Lock to prevent thread deadlock #1008)

AI Disclaimer

This PR was developed with the assistance of either Claude or Codex. I've reviewed and verified the changes.