fix: checker should not error on non-existing dirs

Author: folke

lua/lazy/manage/checker.lua

@@ -19,8 +19,8 @@ function M.fast_check()
     if plugin._.installed then
       plugin._.has_updates = nil
       local info = Git.info(plugin.dir)
-      local target = Git.get_target(plugin)
-      if info and target and info.commit ~= target.commit then
+      local ok, target = pcall(Git.get_target, plugin)
+      if ok and info and target and info.commit ~= target.commit then
         plugin._.has_updates = true
       end
     end