Update wordpress
Update wordpress

Changes:

- https://github.com/docker-library/wordpress/commit/6e29f5a: Merge pull request https://github.com/docker-library/wordpress/pull/510 from infosiftr/php7.4
- https://github.com/docker-library/wordpress/commit/68c8c47: Merge pull request https://github.com/docker-library/wordpress/pull/511 from infosiftr/opcache
- https://github.com/docker-library/wordpress/commit/def14e3: Stop building "opcache" (it's already pre-built in the "php" images)
- https://github.com/docker-library/wordpress/commit/cc4ec59: Update default PHP version to 7.4

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