Update ghost
Update ghost

Changes:

- https://github.com/docker-library/ghost/commit/46627a4: Update to 3.35.4, ghost-cli 1.14.1
- https://github.com/docker-library/ghost/commit/c3f8449: Merge pull request https://github.com/docker-library/ghost/pull/235 from tyler-nguyen/updating-alpine
- https://github.com/docker-library/ghost/commit/e1e78aa: updated alpine to v3.12

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