feat(container): update image caddy to v2.7.2 (#13)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [caddy](https://github.com/caddyserver/caddy-docker) | final | minor
| `2.6.4-alpine` -> `2.7.2-alpine` |

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Dockerfile

@@ -46,7 +46,7 @@ RUN wget "$OVERMIND_URL" && gunzip ${OVERMIND_FILE} && chmod +x "$OVERMIND"
 #
 # Fly app
 #
-FROM caddy:2.6.4-alpine
+FROM caddy:2.7.2-alpine
 
 ARG SUPERCRONIC
 ARG OVERMIND