leapp:如何解决报告的 Risk Factor HIGH "GRUB core will be updated during upgrade"

Issue

• 当将系统从 RHEL7 升级到 RHEL8，或将 RHEL8 升级到 RHEL 9 时，会报告以下风险因素（Risk Factor）

  Risk Factor: high
  Title: GRUB core will be updated during upgrade
  Summary: On legacy (BIOS) systems, GRUB core (located in the gap between the MBR and the first partition) does not get automatically updated when GRUB is upgraded.
  Key: baa75fad370c42fd037481909201cde9495dacf4