chore(deps): update pulumi/actions action to v6

Author: renovate[bot]

.github/workflows/release-prod.yml

@@ -95,7 +95,7 @@ jobs:
           cat $HOME/.kube/config
         shell: bash
       - name: Deploy with Pulumi
-        uses: pulumi/actions@v5
+        uses: pulumi/actions@v6
         with:
           command: up
           stack-name: prod

.github/workflows/release.yml

@@ -95,7 +95,7 @@ jobs:
           cat $HOME/.kube/config
         shell: bash
       - name: Deploy with Pulumi
-        uses: pulumi/actions@v5
+        uses: pulumi/actions@v6
         with:
           command: up
           stack-name: dev