Use fixed slack action param in multinode workflows

Author: elelaysh

.github/workflows/stackhpc-multinode-periodic.yml

@@ -38,7 +38,7 @@ jobs:
     name: Multinode periodic
     needs:
       - generate-inputs
-    uses: stackhpc/stackhpc-openstack-gh-workflows/.github/workflows/multinode.yml@1.7.0
+    uses: stackhpc/stackhpc-openstack-gh-workflows/.github/workflows/multinode.yml@1.7.1
     with:
       multinode_name: mn-periodic-${{ github.run_id }}
       os_distribution: ${{ needs.generate-inputs.outputs.os_distribution }}

.github/workflows/stackhpc-multinode.yml

@@ -95,7 +95,7 @@ jobs:
   multinode:
     name: Multinode
     needs: github_user_ssh_keys
-    uses: stackhpc/stackhpc-openstack-gh-workflows/.github/workflows/multinode.yml@1.7.0
+    uses: stackhpc/stackhpc-openstack-gh-workflows/.github/workflows/multinode.yml@1.7.1
     with:
       multinode_name: ${{ inputs.multinode_name }}
       os_distribution: ${{ inputs.os_distribution }}