Merge pull request #34398 from joncojonathan/keepass_mono54

keepass: change from mono40 to mono54

pkgs/top-level/all-packages.nix

···
   inherit (gnome3) evince;
   evolution_data_server = gnome3.evolution_data_server;
 
-  keepass = callPackage ../applications/misc/keepass { };
+  keepass = callPackage ../applications/misc/keepass { 
+    buildDotnetPackage = buildDotnetPackage.override { mono = mono54; };
+  };
 
   keepass-keeagent = callPackage ../applications/misc/keepass-plugins/keeagent { };