fix(keymaps): update deprecated diagnostic keymap to latest api change (#6574)

## Description

refectors deprecated `diagnostic_goto` calls to newer
`vim.diagnostic.jump` API.

## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/config/keymaps.lua

@@ -120,10 +120,12 @@ end, { desc = "Format" })
 
 -- diagnostic
 local diagnostic_goto = function(next, severity)
-  local go = next and vim.diagnostic.goto_next or vim.diagnostic.goto_prev
-  severity = severity and vim.diagnostic.severity[severity] or nil
   return function()
-    go({ severity = severity })
+    vim.diagnostic.jump({
+      count = (next and 1 or -1) * vim.v.count1,
+      severity = severity and vim.diagnostic.severity[severity] or nil,
+      float = true,
+    })
   end
 end
 map("n", "<leader>cd", vim.diagnostic.open_float, { desc = "Line Diagnostics" })