fix: parse body when unsupported HTTP/2 upgrade is requested #783
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According to the RFC https://datatracker.ietf.org/doc/html/rfc7540#section-3.2 "A server that does not support HTTP/2 can respond to the request as though the Upgrade header field were absent"
Crow does not support HTTP/2 at the moment, however when an upgrade is requested the body of the request is not parsed.
This commit fixes that.
See the tests for a request that triggers this behavior.