.oniro-ci: switch to booting manifest

With the move to booting.oniroproject.org the manifest repository has a
new URL. Switch to it to ensure that continuous integration does not
rely on old infrastructure.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

.oniro-ci/build-generic.yaml

@@ -9,7 +9,7 @@
   tags: [large-disk, $CI_ONIRO_RUNNER_TAG, $CI_ONIRO_INSTANCE_SIZE]
   variables:
     CI_ONIRO_RUNNER_TAG : ""
-    CI_ONIRO_MANIFEST_URL: https://git.ostc-eu.org/distro/oniro
+    CI_ONIRO_MANIFEST_URL: https://booting.oniroproject.org/distro/oniro
     CI_ONIRO_MANIFEST_BRANCH: dunfell
     CI_ONIRO_MANIFEST_NAME: default.xml
     CI_ONIRO_MANIFEST_MIRROR: ostc-develop