.gitlab-ci.d/cirrus: Drop support for macOS 13 (Ventura)

.gitlab-ci.d/cirrus: Drop support for macOS 13 (Ventura)

macOS 15 "Sequoia" was released on September 16, 2024 [1].

According to QEMU's support policy, we stop supporting
the previous major release two years after the the new
major release has been published. Time to remove support
for macOS 13 (Ventura, released on October 2022, [2]).

Promote the macOS 14 job, which was only built manually,
to be run by default.

[1] https://www.apple.com/newsroom/2024/09/macos-sequoia-is-available-today/
[2] https://www.apple.com/newsroom/2022/10/macos-ventura-is-now-available/

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240917085058.1740-3-philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>