Pin DCGM version for A3H

Author: saumyasharma03

examples/machine-learning/a3-highgpu-8g/a3high-slurm-blueprint.yaml

@@ -193,7 +193,9 @@ deployment_groups:
               - cuda-toolkit-12-8
               - nvidia-dkms-580-server-open
               - nvidia-driver-580-server-open
-              - datacenter-gpu-manager-4-cuda13
+              - datacenter-gpu-manager-4-cuda13=1:4.6.0-1
+              - datacenter-gpu-manager-4-dev=1:4.6.0-1
+              - datacenter-gpu-manager-4-core=1:4.6.0-1
               - libnvidia-nscq-580
               - nvidia-container-toolkit
             tasks:
@@ -209,10 +211,11 @@ deployment_groups:
               ansible.builtin.apt:
                 name: "{{ item }}"
                 update_cache: true
+                allow_downgrade: yes
               loop: "{{ nvidia_packages }}"
             - name: Freeze NVIDIA drivers and CUDA
               ansible.builtin.dpkg_selections:
-                name: "{{ item }}"
+                name: "{{ item.split('=')[0] }}"
                 selection: hold
               loop: "{{ nvidia_packages }}"
             - name: Create nvidia-persistenced override directory