v0.19.1

• Marked Python 3.11 as supported. Python 3.8 support will likely be dropped in the coming months.
• (client.api) Added request payload memory optimization to MSC3870 URL uploads.
  • aiohttp will duplicate the entire request body if it's raw bytes, which wastes a lot of memory. The optimization is passing an iterator instead of raw bytes, so aiohttp won't accidentally duplicate the whole thing.
  • The main HTTPAPI has had the optimization for a while, but uploading to URL calls aiohttp manually.