Exclude base-files from being branched during release steps

branch.yaml

 defaults:
-  - &current_release_branch apertis/v2021dev3
-  - &current_release_internal_branch apertis/v2021dev3+internal
-  - &previous_release_branch apertis/v2021dev2
-  - &previous_release_internal_branch apertis/v2021dev2+internal
+  - &current_release_branch apertis/v2022dev0
+  - &current_release_internal_branch apertis/v2022dev0+internal
+  - &previous_release_branch apertis/v2021pre
+  - &previous_release_internal_branch apertis/v2021pre+internal
 
 default_branches: &default_branches
   - name: *current_release_branch
@@ -51,6 +51,7 @@ rules:
     excludes:
       - *unversioned_repositories
       - *internal_repositories
+      - pkg/target/base-files
     ensure_branches: *default_branches
     default_branch: *current_release_branch