apache2 regression

USN-6885-1 fixed vulnerabilities in Apache. The patch for
CVE-2024-38474 was incomplete and caused a regression.
This update provides the fix for this issue.

Original advisory details:

Orange Tsai discovered that the Apache HTTP Server mod_rewrite
module incorrectly handled certain substitutions. A remote attacker
could possibly use this issue to execute scripts in directories
not directly reachable by any URL, or cause a denial of service.
Some environments may require using the new UnsafeAllow3F flag
to handle unsafe substitutions. (CVE-2024-38474)