chore(deps): bump wpackagist-plugin/wp-discourse from 2.5.4 to 2.5.6

Bumps wpackagist-plugin/wp-discourse from 2.5.4 to 2.5.6.

---
updated-dependencies:
- dependency-name: wpackagist-plugin/wp-discourse
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]