Upgrade to libnghttp2 1.50
This adds the new API nghttp2_option_set_no_rfc9113_leading_and_trailing_ws_validation which is required to fix libsoup#300 (closed).
This adds the new API nghttp2_option_set_no_rfc9113_leading_and_trailing_ws_validation which is required to fix libsoup#300 (closed).