Docker revert to Debian 12 Bookworm (#7805)

Fix https://github.com/FreshRSS/FreshRSS/issues/7798
Revert https://github.com/FreshRSS/FreshRSS/pull/7772
Revert https://github.com/FreshRSS/FreshRSS/commit/af6f7f013ae5b908520aa0d9fb0e0b56247ff026

Docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:trixie-slim
+FROM debian:12-slim
 
 ENV TZ=UTC
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]