ci/build-generic.yaml: Default to the kirkstone branch for the manifest repo

This is now the currently main development branch.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

.oniro-ci/build-generic.yaml

@@ -10,7 +10,7 @@
   variables:
     CI_ONIRO_RUNNER_TAG : ""
     CI_ONIRO_MANIFEST_URL: https://gitlab.eclipse.org/eclipse/oniro-core/oniro
-    CI_ONIRO_MANIFEST_BRANCH: dunfell
+    CI_ONIRO_MANIFEST_BRANCH: kirkstone
     CI_ONIRO_MANIFEST_NAME: default.xml
     CI_ONIRO_MANIFEST_MIRROR: oniro-develop
     CI_ONIRO_GIT_REPO_PATH: ""