Fix semantic of HttpVersion::V3 for libcurl >= 7.88.0
#521
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CURL_HTTP_VERSION_3, introduced in curl 7.66.0, has changed with curl 7.88.0. Prior 7.88.0, CURL_HTTP_VERSION_3 implies no fallback if error; since 7.88.0, CURL_HTTP_VERSION_3 can fallback to HTTP/1 or HTTP/2. There is a new flag CURL_HTTP_VERSION_3_ONLY that doesn't fallback. See curl/curl#10264.
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CURL_HTTP_VERSION_3, introduced in curl 7.66.0, has changed with curl 7.88.0. Prior 7.88.0, CURL_HTTP_VERSION_3 implies no fallback if error; since 7.88.0, CURL_HTTP_VERSION_3 can fallback to HTTP/1 or HTTP/2. There is a new flag CURL_HTTP_VERSION_3_ONLY that doesn't fallback. See curl/curl#10264.
Fixes #519.