chore(deps): update caddy docker tag to v2.6.0 (#3)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [caddy](https://github.com/caddyserver/caddy-docker) | final | minor | `2.5.2` -> `2.6.0` |
| [caddy](https://github.com/caddyserver/caddy-docker) | stage | minor | `2.5.2-builder` -> `2.6.0-builder` |

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Reviewed-on: #3
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Dockerfile

@@ -1,8 +1,8 @@
-FROM caddy:2.5.2-builder AS builder
+FROM caddy:2.6.0-builder AS builder
 
 RUN xcaddy build \
     --with github.com/caddy-dns/cloudflare
 
-FROM caddy:2.5.2
+FROM caddy:2.6.0
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy