flake: fix deprecations

user/git.nix

@@ -12,7 +12,7 @@ in
     programs.git = {
       enable = true;
       lfs.enable = true;
-      extraConfig = {
+      settings = {
         user = {
           name = username;
           email = mail.personal.user;

user/ssh.nix

@@ -2,6 +2,7 @@
   config = {
     programs.ssh = {
       enable = true;
+      enableDefaultConfig = false;
       matchBlocks = {
         monolith = {
           user = "lelgenio";