chore: update CozyStack upstream to b810dbd

Auto-updated CozyStack dependency on 2026-05-11

Upstream commit: b810dbd
Upstream date: 2026-05-11T08:16:36Z
Patch compatibility: failure

Author: github-actions[bot]

.github/workflows/build-talos-images.yml

@@ -41,7 +41,8 @@ on:
       cozystack_commit:
         description: 'CozyStack upstream commit (for reproducible builds)'
         required: false
-        default: 'HEAD'  # Use latest main
+        default: 'b810dbd'  # Use latest main
+        # Auto-updated 2026-05-11 to upstream b810dbd
       extension_variant:
         description: 'Extension variant to build'
         required: false