Return support for `em_http_request`

[Koilanetroc]

In version 3.24.0 support for em_http_request was dropped due to:

The current version of em-http-request (1.1.7) is incompatible with Ruby 3.4 due to an unresolved issue (igrigorik/em-http-request#365). Support for em-http-request will be re-enabled once the compatibility issue is resolved.

The problem was addressed in igrigorik/em-http-request#354 and now cookiejar supports ruby 3.3+, it was added in this commit.

Therefore in #1103 I returned support for em_http_request, please have a look

[Koilanetroc]

closing as done after merging #1103