- switch from unmaintained brotlipy to Brotli

- skip more tests
- Drop python39-failures.patch, no longer required.
- Update python39-failures.patch to only fire with Python 3.9.7.
* Made exceptions pickleable. Also changed the repr of
some exceptions. #4077
* Raise a ClientResponseError instead of an AssertionError for a
* Fix web_middlewares.normalize_path_middleware behavior for
* Fix overshadowing of overlapped sub-applications prefixes.
* Make BaseConnector.close() a coroutine and wait until the
client closes all connections. Drop deprecated "with
* Reset the sock_read timeout each time data is received for a
* Fixed type annotation for add_view method of UrlDispatcher to
* Fixed querying the address families from DNS that the current
* Change return type of MultipartReader.__aiter__() and
- Fix python 3.6 build
* Response headers are now prepared prior to running