AppArmor regex in `common_steps.rb` soon to become obsolete

Commit 8c4b785 in the mainline Linux kernel, "apparmor: add mediation class information to auditing", introduced a new field - the mediation class - to the audit kernel logs starting from v6.2. Due to this change, the AppArmor regex in the step definition When /^AppArmor has (not )?denied "([^"]+)" from opening "([^"]+)"$/ will soon become obsolete (bookworm-backports and testing are both on v6.6, and unstable is on v6.7).

One possible fix maintaining backwards compatibility is

-    'apparmor="DENIED" operation="open" profile="%<profile>s" name="%<file>s"',
+    'apparmor="DENIED" operation="open" \(class="[a-zA-Z]*" \)\?profile="%<profile>s" name="%<file>s"',

In Tails tests, the new class field only takes on the value "file" currently, but this may change in the future and I doubt defining a new step variable would be of much use.