chore(deps): update foxcpp/maddy docker tag to v0.8.1 (#3063)

* chore(deps): update foxcpp/maddy docker tag to v0.8.1

* 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>

maddy-mail/0.8.1/docker-compose.yml

@@ -15,7 +15,7 @@ services:
     environment:
       - MADDY_HOSTNAME=${MAIL_HOSTNAME}
       - MADDY_DOMAIN=${MAIL_DOMAIN}
-    image: foxcpp/maddy:0.7.1
+    image: foxcpp/maddy:0.8.1
     labels:  
       createdBy: "Apps"