Update the master grenade setting

Update master grenade jobs to upgrade testing
- grenade job to test 2025.1(N-1) to master(N) upgrade
- grenade skip level job to test 2024.2(N-2) to master(N) upgrade

Also, heat job is failing 100%, so making it non voting to merge this change.

Depends-On: https://review.opendev.org/c/openstack/devstack/+/945237
Change-Id: I5e0110a61a5a5635530813cb76fb0c86f3ef661c

.zuul.yaml

@@ -5,7 +5,9 @@
       jobs:
         - grenade
         - grenade-multinode
-        - grenade-heat-multinode
+        # TODO(gmann) heat job is failing 100%, make it voting again once it is green.
+        - grenade-heat-multinode:
+            voting: false
         - octavia-grenade
         - ironic-grenade:
             voting: false
@@ -14,7 +16,7 @@
       jobs:
         - grenade
         - grenade-multinode
-        - grenade-heat-multinode
+        # - grenade-heat-multinode
         - octavia-grenade
         - grenade-skip-level-always
     experimental:
@@ -393,6 +395,6 @@
     vars:
       # For the base "always" job, this should always be the N-2 release
       # for projects that want to assert N-2 upgradability on all releases.
-      grenade_from_branch: stable/2024.1
+      grenade_from_branch: stable/2024.2
       grenade_localrc:
         NOVA_ENABLE_UPGRADE_WORKAROUND: True

roles/configure-grenade-branches/defaults/main.yaml

@@ -1,3 +1,3 @@
 ---
-grenade_from_branch: stable/2024.2
+grenade_from_branch: stable/2025.1
 grenade_to_branch: master