Commit 0ea1ba87 ("third_party: update libcurl from 8.3.0 to 8.4.0")
bumps libcurl version and bringed a regression: http client returns
nothing using connection with HTTP/2 protocol. The problem could be
reproduced by etcd-client, see description in issue [1]. The problem in
http client is due to commit "h2: testcase and fix for pausing h2
streams" [2] in libcurl. With reverted commit in libcurl the problem is
gone.

To work around the issue, commit sets HTTP 1.1 as default protocol in
http client.

Needed for #9547

1. https://github.com/tarantool/tarantool/issues/9547
2. https://github.com/curl/curl/commit/6b9a591bf7d82031f463373706d7de1cba0adee6

NO_CHANGELOG=workaround
NO_DOC=workaround
NO_TEST=etcd client's tests in Tarantool EE