Merge bitcoin/bitcoin#27174: ci: bump lint task to bookworm for git v2.38

a984bee [ci] change lint to bookworm for git v2.38 (glozow)

Pull request description:

  Since 5497c14, verify-commits.py uses `git merge-tree` which requires git v2.38 or later. Fix the lint jobs on master (e.g. https://cirrus-ci.com/task/4971007513985024).

ACKs for top commit:
  achow101:
    ACK a984bee
  hebasto:
    re-ACK a984bee

Tree-SHA512: dd50598aefb6f9c86cf221dea27fcc521e335cb182f7a3abcb3215d3991794354085be3e07c133ab74ca8b957e3a6acc43722899165957b3d898867d6253ebdc

Author: fanquake

.cirrus.yml

@@ -61,10 +61,10 @@ compute_credits_template: &CREDITS_TEMPLATE
   use_compute_credits: $CIRRUS_REPO_FULL_NAME == 'bitcoin/bitcoin' && $CIRRUS_PR != ""
 
 task:
-  name: 'lint [jammy]'
+  name: 'lint [bookworm]'
   << : *BASE_TEMPLATE
   container:
-    image: ubuntu:jammy
+    image: debian:bookworm
     cpu: 1
     memory: 1G
   # For faster CI feedback, immediately schedule the linters