docs(CHANGELOG): record the RHEL 10 promotion of setup_basic roles

The previous commit (759ede4) updated COMPATIBILITY.md but the
CHANGELOG entry did not make it into the commit. Add it as a
follow-up.

Author: markuslf

CHANGELOG.md

@@ -71,6 +71,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * **role:freeipa_client**: Add `meta/argument_specs.yml`. No behaviour change.
 * **role:haveged, role:libmaxminddb, role:qemu_guest_agent**: README now also explains *what* the underlying tool actually does and when you'd want it (entropy daemon, MaxMind GeoIP reader library, hypervisor-to-guest communication channel) instead of just linking out.
 * **roles**: README intros across 19 roles (`ansible_init`, `cockpit`, `collect_rpmnew_rpmsave`, `crypto_policy`, `hostname`, `kdump`, `repo_collabora`, `repo_docker`, `repo_gitlab_ce`, `repo_gitlab_runner`, `repo_grafana`, `repo_influxdb`, `repo_mongodb`, `repo_redis`, `selinux`, `snmp`, `sshd`, `timezone`, `unattended_upgrades`) now explain in one or two sentences what the underlying software actually is and when an admin would use it, instead of just naming it.
+* **COMPATIBILITY**: Promote the RHEL 10 column from `(x)` (or empty) to `x` (proven) for the 23 roles exercised by `setup_basic` and validated on a RHEL 10 host: `at`, `cloud_init`, `cockpit`, `dnf_makecache`, `hostname`, `icinga2_agent`, `kdump`, `login`, `lvm`, `mailto_root`, `monitoring_plugins`, `motd`, `network`, `python`, `python_venv`, `repo_icinga`, `repo_monitoring_plugins`, `rsyslog`, `selinux`, `system_update`, `systemd_journald`, `timezone`, `tools`. `glances` stays at `(x)` because the package is missing in EPEL 10 (see the role's "Platform Support" section).
 * **COMPATIBILITY**: `at`, `haveged`, `mod_maxminddb` and `qemu_guest_agent` are now expected to work on Debian 12 / 13 and Ubuntu 22.04 / 24.04 / 26.04 (marked `(x)`: code-reviewed, untested in production).
 * **role:hostname, role:kdump, role:timezone**: Add `meta/argument_specs.yml` so Ansible validates the role variables (types, choices) at role entry. No behaviour change.
 * **role:libmaxminddb, role:mod_maxminddb**: Add `meta/argument_specs.yml`. No behaviour change.