Bug 1867143 - Upgrade partner-repack docker image to Debian 12. r=releng-reviewers,bhearsum

Differential Revision: https://phabricator.services.mozilla.com/D194954

taskcluster/ci/docker-image/kind.yml

@@ -226,7 +226,7 @@ jobs:
         parent: debian12-base
     partner-repack:
         symbol: I(PR)
-        parent: debian11-base
+        parent: debian12-base
         definition: partner-repack
     updatebot:
         symbol: I(3rdp)