ci: Update default branch for Packit to 3.9-devel/release

.packit.yaml

@@ -4,7 +4,7 @@ actions:
     - 'git config user.email "[email protected]"'
     - 'git config user.name "Blivet CI"'
     # merge the release branch to get correct version in spec
-    - 'git merge --ff origin/3.8-release'
+    - 'git merge --ff origin/3.9-release'
   get-current-version:
     - "python3 ./setup.py --version"
   create-archive:
@@ -28,7 +28,7 @@ jobs:
   trigger: commit
   owner: "@storage"
   project: blivet-daily
-  branch: 3.8-devel
+  branch: 3.9-devel
   preserve_project: true
 
 srpm_build_deps: