[Header] Remove unnecessary import

nvim/lua/plugins/util/header.lua

@@ -27,7 +27,6 @@ return {
         autocmd("BufWritePre", {
             pattern = "*",
             callback = function()
-                local header = require("header")
                 if header and header.update_date_modified then
                     header.update_date_modified()
                 else
@@ -41,7 +40,6 @@ return {
         autocmd({ "BufNewFile", "BufReadPost" }, {
             pattern = "*",
             callback = function()
-                local header = require("header")
                 if not header then
                     vim.notify_once(
                         "Could not automatically add header to new file: header module couldn't be found",