Extend compat HTTP="0.8, 0.9, 1, 2"

[ablaom]

I had a go at this but am out of depth. Here are the problems:

• When using Pkg.test() the pre-compilation of HTTP hangs locally (on Julia 1.12.6). I don't know how to fix this, but a workaround is to run `julia --project=. -e 'using Pkg; Pkg.test(julia_args=["--compiled-modules=existing"])' in the OpenML.jl root directory.

• Tests fail when I run them line by line. Here's the error I'm getting:

julia> response_test = OpenML.load_Dataset_Description(61)
ERROR: http parse error: unexpected EOF while reading HTTP/1 data
Stacktrace:
  [1] _readline_crlf(reader::HTTP._ConnReader, max_line_bytes::Int64)
    @ HTTP ~/.julia/packages/HTTP/M97zq/src/http_transport.jl:1251
  [2] _read_transport_incoming_response(reader::HTTP._ConnReader, transport::HTTP.Transport, conn::HTTP.Conn, request::HTTP.Request{…}, max_line_bytes::Int64, max_header_bytes::Int64)
    @ HTTP ~/.julia/packages/HTTP/M97zq/src/http_transport.jl:1514
  [3] _read_transport_incoming_response
    @ ~/.julia/packages/HTTP/M97zq/src/http_transport.jl:1514 [inlined]
  [4] _roundtrip_incoming!(transport::HTTP.Transport, address::String, request::HTTP.Request
{HTTP.EmptyBody}, secure::Bool, server_name::String, proxy_config::HTTP.ProxyConfig, attempt
::Int64)                                                                                   
    @ HTTP ~/.julia/packages/HTTP/M97zq/src/http_transport.jl:1702
  [5] _roundtrip_incoming!
    @ ~/.julia/packages/HTTP/M97zq/src/http_transport.jl:1609 [inlined]
  [6] _do_incoming!(trace::Nothing, client::HTTP.Client{…}, address::String, request::HTTP.Request{…}, secure::Bool, server_name::String, protocol::Symbol, redirect_policy::HTTP._RedirectPolicy{…}, retry_controller::HTTP._RetryController{…}, proxy_config::HTTP.ProxyConfig, cookies::Bool, cookiejar::CookieJar)                                                        
    @ HTTP ~/.julia/packages/HTTP/M97zq/src/http_client.jl:746
  [7] request(method::String, url::String, h::Vector{…}, b::Nothing; headers::Vector{…}, body::Nothing, basicauth::Nothing, retry::Bool, retries::Int64, retry_non_idempotent::Bool, retry_if::Nothing, respect_retry_after::Bool, retry_bucket::Bool, status_exception::Bool, redirect::Bool, redirect_limit::Nothing, redirect_method::Nothing, forwardheaders::Bool, proxy::HTTP._UseTransportProxy, cookies::Bool, cookiejar::Nothing, query::Nothing, response_stream::
Nothing, decompress::Nothing, max_decompressed_size::Int64, sse_callback::Nothing, client::Nothing, context::Nothing, connect_timeout::Int64, request_timeout::Int64, response_header_timeout::Int64, read_idle_timeout::Int64, write_idle_timeout::Int64, expect_continue_timeout::
Nothing, readtimeout::Nothing, copyheaders::Nothing, pool::Nothing, canonicalize_headers::Nothing, detect_content_type::Nothing, observelayers::Nothing, retry_delays::Nothing, retry_check::Nothing, sslconfig::Nothing, socket_type_tls::Nothing, logerrors::Nothing, logtag::Nothing, trace::Nothing, verbose::Nothing, require_ssl_verification::Bool, protocol::Symbol)
    @ HTTP ~/.julia/packages/HTTP/M97zq/src/http_client.jl:1843
  [8] request (repeats 2 times)
    @ ~/.julia/packages/HTTP/M97zq/src/http_client.jl:1716 [inlined]
  [9] get(query::String)
    @ OpenML ~/MLJ/OpenML/src/data.jl:14
 [10] load_Dataset_Description(id::Int64)
    @ OpenML ~/MLJ/OpenML/src/data.jl:45
 [11] top-level scope
    @ REPL[6]:1

caused by: http2: unexpected ALPN protocol http/1.1; want h2

HTTP 2 is a complete re-write, but I don't understand what has broken here.

@jbrea Are you able to help out with this?

cc @pebeto