gitlab: Fix build container dependencies for build jobs

A couple of these were wrong, resulting in the build job not
waiting for the correct container to be built before starting.

Fixes: 77296c807b

Signed-off-by: Andrea Bolognani <abologna@redhat.com>

.gitlab-ci.yml

@@ -486,7 +486,7 @@ mipsel-debian-10:
 s390x-debian-sid:
   extends: .cross_build_job
   needs:
-    - s390x-debian-10-container
+    - s390x-debian-sid-container
   variables:
     NAME: debian-sid
     CROSS: s390x
@@ -502,7 +502,7 @@ i686-debian-sid:
 ppc64le-debian-sid:
   extends: .cross_build_job
   needs:
-    - ppc64le-debian-10-container
+    - ppc64le-debian-sid-container
   variables:
     NAME: debian-sid
     CROSS: ppc64le