C0: valkey — bump kustomization tags to main-branch SHA

Routine post-merge follow-up after #346. Branch SHA tag (946fa75) replaced
with the main-SHA-built tag (fabca04) so paperless and immich reference an
image traceable to a commit on main.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

argocd/manifests/immich/kustomization.yaml

@@ -20,4 +20,4 @@ images:
     newTag: v2.6.3
   - name: docker.io/valkey/valkey
     newName: registry.ops.eblu.me/blumeops/valkey
-    newTag: v8.1.6-r0-946fa75
+    newTag: v8.1.6-r0-fabca04

argocd/manifests/paperless/kustomization.yaml

@@ -16,4 +16,4 @@ images:
     newTag: v2.20.13-07f52e9
   - name: docker.io/library/redis
     newName: registry.ops.eblu.me/blumeops/valkey
-    newTag: v8.1.6-r0-946fa75
+    newTag: v8.1.6-r0-fabca04