fix: move to Go 1.22

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>

go.mod

@@ -1,3 +1,3 @@
 module git.newtype.fr/ryan/systemd-openbaod
 
-go 1.23
+go 1.22

nix/modules/vault-secrets.nix

@@ -20,8 +20,6 @@ let
           defaultText = "/run/credentials/$service.service/$name";
           description = ''
             Absolute path to systemd's loaded credentials.
-            WARNING: Using this path might break if systemd in future decides to use
-            a different location but /run/credentials
           '';
         };
       };