Bug#1144668: perl: CVE-2026-19487: incorrect regular expression match results in Perl < 5.42

[Arnaud Rebillout]

It seems that this CVE was fixed in trixie (commit 
79907dd1d11e2f46be7f8e4e8912c688a060aef3), but wasn't mentioned in 
d/changelog for 5.40.1-6+deb13u1.