cert-manager: upgrade from v1.12.2 to v1.12.17

Change-Id: I353351d82af5154035da2cdf34c04e34939a0517
diff --git a/flake.nix b/flake.nix
index 0d89f4e..a702c4f 100644
--- a/flake.nix
+++ b/flake.nix
@@ -36,6 +36,7 @@
             pkgs.k9s
             pkgs.k3sup
             pkgs.git
+            pkgs.kubernetes-helm
             alias-kubectl
           ];
         };