CI: Stick with ubuntu-22.04 for CodeQL analysis

The ubuntu-latest alias now refers to ubuntu-24.04 instead of
ubuntu-22.04 which causes CodeQL's autobuild to fail with:

    cpp/autobuilder: deptrace not supported in ubuntu 24.04

Until deptrace is supported by ubuntu-24.04 hosted runners request
ubuntu-22.04 which is supported.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Closes #16639