build(deps): update caddy docker tag to v2.6.0 (#4042)

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

internal/suites/example/compose/caddy/Dockerfile

@@ -1,7 +1,7 @@
-FROM caddy:2.5.2-builder AS builder
+FROM caddy:2.6.0-builder AS builder
 
 RUN xcaddy build fix-empty-copy-headers
 
-FROM caddy:2.5.2
+FROM caddy:2.6.0
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy

internal/suites/example/compose/caddy/docker-compose.yml

@@ -3,7 +3,7 @@ version: '3'
 services:
   caddy:
     # build: ./example/compose/caddy/ # used for debugging
-    image: caddy:2.5.2-alpine
+    image: caddy:2.6.0-alpine
     volumes:
       - ./example/compose/caddy/Caddyfile:/etc/caddy/Caddyfile
     networks: