This update for opensuse-migration-tool fixes the following issues:

- Update to version 20260204.2cf77a3:
* Drop requires on update-bootloader as it's not available on 15.6.
Install it in post-script on target of migration instead. boo#1255897
* Refine post-scritps
* Ensure update bootloader is installed in post scripts
* don't install selinux-policy-targeted-gaming by default

- Add dependency on update-bootloader to fix boo#1255897