chore(deps): update traefik:v3.6.7 docker digest to a9890c8

Author: renovate[bot]

src/development/stack.yml

@@ -109,7 +109,7 @@ services:
       placement:
         constraints:
         - node.role == manager
-    image: traefik:v3.6.7@sha256:140d1fe3ba042682b8c93e8d0fdff043f9d6b27654bd9e84599d7ed220cf2ec7
+    image: traefik:v3.6.7@sha256:a9890c898f379c1905ee5b28342f6b408dc863f08db2dab20e46c267d1ff463a
     ports:
     - mode: host
       protocol: tcp