Update nagyesta/lowkey-vault Docker tag to v6.0.6

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

docker-compose/docker-compose.yml

@@ -5,7 +5,7 @@ version: "3"
 services:
   lowkey-vault:
     container_name: docker-compose-lowkey-vault
-    image: nagyesta/lowkey-vault:6.0.0@sha256:53d32e058928d67f55e730bf1be0cf9ee8b51c34e1bc58ca41d3ea8642fe8aed
+    image: nagyesta/lowkey-vault:6.0.6@sha256:a659b4629e51f371f1bd875dfdfddb34f1a9809ec4c725180c572a05a05725fb
     ports:
       - "8443:8443"
     volumes: