Qh3

===================

**Fixed**
- Improved stream write scheduling. (upstream patch https://github.com/aiortc/aioquic/pull/475)

**Misc**
- CI now prepare a complete sdist with required vendors
- aarch64 linux is now served

===================

**Changed**
- Highly simplified ``_crypto`` module based on upstream work https://github.com/aiortc/aioquic/pull/457
- Bump upper bound ``cryptography`` version to 42.x

**Fixed**
- Mitigate deprecation originating from ``cryptography`` about datetime naïve timezone.

===================

**Changed**
- Converted our ``Buffer`` implementation to native Python instead of C as performance are plain better thanks to CPython internal optimisations

**Fixed**
- Addressed performance concerns when attributing new stream ids
- The retry token was based on a weak key

**Added**
- ``StopSendingReceived`` event
- Property ``open_outbound_streams`` in ``QuicConnection``
- Property ``max_concurrent_bidi_streams`` in ``QuicConnection``
- Property ``max_concurrent_uni_streams`` in ``QuicConnection``
- Method ``get_cipher`` in ``QuicConnection``
- Method ``get_peercert`` in ``QuicConnection``
- Method ``get_issuercerts`` in ``QuicConnection``

===================

**Added**
- Support for in-memory certificates (client/intermediary) via ``Configuration.load_cert_chain(..)``

**Removed**
- (internal) Unused code in private ``_vendor.OpenSSL``

===================

**Changed**
- All **INFO** logs entries are downgraded to **DEBUG**

**Removed**
- Certifi will no longer be used if present in the environment. Use jawah/wassima as a super replacement.

**Deprecated**
- ``H0Connection`` will be removed in the 1.0 milestone. Use HTTP Client Niquests instead.

===================

**Fixed**
- **QuicConnection** ignored ``verify_hostname`` context option (PR 16 by doronz88)