beaker: install openssl-devel for gem native ext builds

Recent io-stream releases (>= 0.13.2) declare a runtime dependency
on the openssl gem >= 3.3, which is newer than Ruby's bundled
default (3.2.2). When bundler needs to compile that gem from
source, it fails because openssl-devel was never installed here:

    checking for pkg-config for openssl... not found
    checking for openssl/ssl.h... no
    *** extconf.rb failed ***

This broke foreman-pipeline-candlepin-rpm-nightly starting with the
2026-07-13 run. See SAT-47706.

Author: ogajduse

roles/beaker/tasks/main.yml

@@ -42,6 +42,7 @@
       - redhat-rpm-config
       - libffi-devel
       - libyaml-devel
+      - openssl-devel
 
 - name: Clone puppet module
   ansible.builtin.git: