Update wordpress
Update wordpress

Changes:

- https://github.com/docker-library/wordpress/commit/0f81a03: Merge pull request https://github.com/docker-library/wordpress/pull/577 from infosiftr/restore-default-env-values
- https://github.com/docker-library/wordpress/commit/c313a26: Remove newlines from `_FILE` contents
- https://github.com/docker-library/wordpress/commit/95ca33a: Use WordPress setup default values for env variables; use empty env values

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