chore(backport release-1.8): chore: upgrade base image to openssh~10 (#6150)

Signed-off-by: Kent Rancourt <kent.rancourt@gmail.com>
Co-authored-by: Kent Rancourt <kent.rancourt@gmail.com>

Author: akuitybot

kargo-base.apko.yaml

@@ -10,7 +10,7 @@ contents:
   - gpg~2
   - gpg-agent~2
   - helm~3 # Required for Kustomize Helm plugin
-  - openssh-client~9
+  - openssh-client~10
   - tini
 
 accounts: