rabbitmq-server: Use openssl_1_1 to fix config decryption

Fixes #192499, nixosTests.rabbitmq

Reverts the openssl upgrade introduced in
0565276a07

pkgs/top-level/all-packages.nix

@@ -23864,6 +23864,7 @@ with pkgs;
   rabbitmq-server = callPackage ../servers/amqp/rabbitmq-server {
     inherit (darwin.apple_sdk.frameworks) AppKit Carbon Cocoa;
     elixir = elixir_1_12;
+    erlang = erlang.override { opensslPackage = openssl_1_1; };
   };
 
   radicale2 = callPackage ../servers/radicale/2.x.nix { };