Sync your remote git repo with its upstream (default branch), so you can then pull the changes to your local repo

sync_fork.sh

function sync-fork() {
  local origin_url=$(git config --get remote.origin.url)
  local fork_repo=""
  if [[ $origin_url =~ github\.com[:/]([^/]+/[^/.]+) ]]; then
    fork_repo="${BASH_REMATCH[1]}"
  else
    echo "Error: Could not parse origin remote URL"
    return 1
  fi
  local upstream_url=$(git config --get remote.upstream.url)
  local upstream_repo=""
  if [[ $upstream_url =~ github\.com[:/]([^/]+/[^/.]+) ]]; then
    upstream_repo="${BASH_REMATCH[1]}"
  else
    echo "Error: Could not parse upstream remote URL or upstream not configured"
    return 1
  fi
  echo "Syncing $fork_repo with $upstream_repo..."
  gh repo sync $fork_repo --source $upstream_repo
}