CI: fix 'lxd-ubuntu-lts' naming (after moving it to 24.04/Noble)

Author: slyon

.github/workflows/autopkgtest.yml

@@ -14,7 +14,7 @@ on:
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
-  lxd-ubuntu-jammy:
+  lxd-ubuntu-lts:
     # The type of runner that the job will run on
     runs-on: ubuntu-24.04