git: Development checkout also switched to Staging

Using the `gcd` alias to checkout the development branch switches to, if
no `development` branch is found, the `staging` branch of a repository
automatically instead.

git/.config/sh/alias.d/git.sh

@@ -22,7 +22,7 @@ alias gcn!='git commit -v --no-edit --amend'
 
 if version_at_least 2.23 "$git_version"; then
     alias gcm='git switch master 2>/dev/null || git switch main'
-    alias gcd='git switch develop'
+    alias gcd='git switch develop 2>/dev/null || git switch staging'
     alias gcb='git switch -c'
 else
     alias gcm='git checkout master 2>/dev/null || git checkout main'