Update earthly/dind Docker tag to ubuntu-24.04-docker-27.0.3-1 (#87)

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This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| earthly/dind | minor | `ubuntu-24.04-docker-26.1.4-1` ->
`ubuntu-24.04-docker-27.0.3-1` |

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docs/dockerhub.md

@@ -14,7 +14,7 @@ For which the current latest tags (respectively) are:
 * `alpine-3.20-docker-26.1.3-r1`
 * `ubuntu-20.04-docker-27.0.3-1`
 * `ubuntu-23.04-docker-25.0.2-1`
-* `ubuntu-24.04-docker-26.1.4-1`
+* `ubuntu-24.04-docker-27.0.3-1`
 
 For other available tags, please check out https://hub.docker.com/r/earthly/dind/tags