chore(deps): update crazymax/flarum docker tag to v1.8.8 (#2422)

* chore(deps): update crazymax/flarum docker tag to v1.8.8

* Update app version [skip ci]

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: github-action update-app-version <githubaction@githubaction.com>

flarum/1.8.8/docker-compose.yml

@@ -27,7 +27,7 @@ services:
       - DB_NOPREFIX=false
       - DB_TIMEOUT=60
       - FLARUM_BASE_URL=${FLARUM_EXTERNAL_URL}
-    image: crazymax/flarum:1.8.5
+    image: crazymax/flarum:1.8.8
     labels:
       createdBy: "Apps"
 networks: