remove depreciated show_deleted

.config/nvim/lua/plugins/gitsigns.lua

@@ -40,7 +40,6 @@ return {
       linehl = false,
       word_diff = false,
       trouble = true,
-      show_deleted = false,
       watch_gitdir = {
          interval = 1000,
          follow_files = true,
@@ -67,4 +66,4 @@ return {
          col = 1,
       },
    },
-}
+}