chore(deps): Bump roots/wordpress from 5.5.3 to 5.6 (#567)

Bumps [roots/wordpress](https://github.com/WordPress/WordPress) from 5.5.3 to 5.6.
- [Release notes](https://github.com/WordPress/WordPress/releases)
- [Commits](WordPress/WordPress@5.5.3...5.6)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

composer.json

@@ -36,7 +36,7 @@
     "vlucas/phpdotenv": "^5.2",
     "oscarotero/env": "^2.1",
     "roots/bedrock-autoloader": "^1.0",
-    "roots/wordpress": "5.5.3",
+    "roots/wordpress": "5.6",
     "roots/wp-config": "1.0.0",
     "roots/wp-password-bcrypt": "1.0.0"
   },