chore(deps): update caddy docker tag to v2.6.4 (#11)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [caddy](https://github.com/caddyserver/caddy-docker) | final | patch | `2.6.3-alpine` -> `2.6.4-alpine` |

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Reviewed-on: #11
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Dockerfile

@@ -8,7 +8,7 @@ COPY . ./
 ENV NODE_ENV=production
 RUN yarn build
 
-FROM caddy:2.6.3-alpine
+FROM caddy:2.6.4-alpine
 
 COPY --from=build-deps /app/dist /var/www
 COPY Caddyfile /etc/caddy/Caddyfile